Merge the following revisions from ^/projects/release-vmimage:

 r273823-r273826, r273833, r273836, r273944, r274069-r274071,
 r274134, r274211, r274280-r274285, r274287-r274288, r274292,
 r274296-r274297, r274356, r274533, r274725, r274726, r274729,
 r274734, r274771, r274945-r274946, r277180, r277183-r277184,
 r277186-r277187, r277250-r277253, r277263-r277264, r277383-r277384,
 r277393-r277395, r277438-r277439, r277447, r277455:

 r273823:
  Move virtual machine / cloud provider targets and
  options from release/Makefile to their own Makefile.

 r273824:
  Add glue to allow enabling building cloud provider VM images
  by default.

  When WITH_CLOUDWARE is not empty, add CLOUDTARGETS to the
  release/Makefile 'release' target.

 r273825:
  Avoid hard-coding the Azure image file format.  While here,
  avoid using OSRELEASE for the output file name.

 r273826:
  Remove a few vestiges of passing an exit code to panic().

 r273833:
  Initial commit providing a mechanism to create openstack images
  as part of the release build.

 r273836:
  Fix output file name for openstack images.  No further conversion
  is necessary for this VM file target, so there is no need to append
  the '.raw' suffix here.

 r273944:
  Uncomment the cloudinit rc.conf(5) line.

 r274069:
  Add line continuation so OPENSTACKCONF is actually included in the env(1).

 r274070:
  Add a 'vm-cloudware' target, used to drive all targets in CLOUDTARGETS.

 r274071:
  Add examples for WITH_CLOUDWARE to release.conf.sample.
  Add WITH_CLOUDWARE evaluation to RELEASE_RMAKEFLAGS.

 r274134:
  Initial rewrite to consolidate VM image build scripts into one.

 r274211:
  Add write_partition_layout() used to populate the final image.

  Fix duplicated mkimg(1) call in vm_create_disk().

  Add primitive (untested) PowerPC/PowerPC64 VM image support.

  Note: As it is currently written, the /boot/pmbr and
  /boot/{gptboot,boot1.hfs} use the build host and not the target
  build.  Fixing this is likely going to be a hack in itself.

 r274280:
  Return if vm_create_disk() is unsuccessful.

 r274281:
  Add CLEANFILES entry for VM targets

 r274282:
  Add vm_extra_pre_umount() prototype to vmimage.subr.

 r274283:
  Fix DESTDIR for installworld, and make sure it is created before use.

 r274284:
  Move usage() from vmimage.subr to mk-vmimage.sh, in case vmimage.subr
  has not been sourced.

 r274285:
  Spell 'OPTARG' correctly.  Actually call vm_create_base().

 r274287:
  Fix line continuation in write_partition_layout().
  Remove variable test that is no longer needed.

 r274288:
  Fix scheme flag to mkimg(1).

 r274292:
  mount(8) and umount(8) devfs(5) as needed.

 r274296:
  Change path for mk-vmimage.sh from ${TARGET}/ to scripts/ now that
  it is consolidated into one file.

  Fix paths for the base image and output disk image files.

 r274297:
  Call cleanup() after everything is done.

 r274356:
  Remove a stray directory from CLEANFILES.

 r274533:
  Set the boot partition type to 'apple-boot' for powerpc.

 r274725:
  In vm_install_base(), copy the host resolv.conf into
  the build chroot before attempting to do anything that
  requires working DNS (i.e., pkg bootstrap).

  In vm_extra_pre_umount(), remove the resolv.conf before
  the disk image is unmounted from the backing md(4).

 r274726 (cperciva):
  Silence errors when umounting the chroot's /dev, since it
  probably doesn't exist when we're running this.

  Unmount filesystems before attempting to destroy the md which
  holds them.

 r274729 (cperciva):
  Unmount filesystem and destroy md before we read the vnode from
  disk and package it into a disk image.  Otherwise we end up
  packaging an unclean filesystem.

 r274734 (cperciva):
  Merge duplicative vm-CLOUDTYPE targets before additional duplication
  gets added by the impending arrival of ec2 and gcloud.

 r274771 (cperciva):
  Add NOSWAP option which can be set by a vmimage.conf file to specify
  that no swap space should be created in the image.  This will be used
  by EC2 builds, since FreeBSD/EC2 allocates swap space on "ephemeral"
  disks which are physically attached to the Xen host node.

 r274945:
  In vm_extra_install_packages(), only bootstrap pkg(8) if
  VM_EXTRA_PACKAGES is empty.

  In vm_extra_pre_umount(), cleanup downloaded packages if pkg(8) was
  bootstrapped earlier.

 r274946:
  Fix indentation nit.

 r277180:
  In vm_extra_install_base(), do not install waagent in the openstack
  image, because it is not used.  This appears to be a copy mistake.

  Remove vm_extra_install_base() from the openstack.conf entirely,
  since it does not need to be overridden.

 r277183:
  Enable the textmode console by default for VM images, since there is
  no way to tell if the environment will be able to use the
  graphics-mode console.

 r277184:
  Enable password-less sudo for openstack images.

 r277186:
  Update the VM_EXTRA_PACKAGES list for the openstack images.

  The documentation suggests doing a "just fetch this and run it"-style
  bootstrap, from which the list of dependencies was obtained (in
  github, at: pellaeon/bsd-cloudinit-installer)

  There is one Python dependency unmet, oslo.config, which is not in
  the Ports Collection.

 r277187:
  Add a comment to note that setting hw.vga.textmode=1 is temporary.

 r277250:
  Remove vm_extra_install_base() for the Azure image, now that the
  waagent exists in the ports tree.

  Add sysutils/azure-agent to the VM_EXTRA_PACKAGES list.

  In vm_extra_pre_umount(), remove the explicit pkg(8) install
  list, as dependencies are resolved by sysutils/azure-agent.

 r277251:
  Add a 'list-cloudware' target to print the list of supported CLOUDWARE
  values and a description.

  Add the AZURE_DESC and OPENSTACK_DESC descriptions.

 r277252:
  Update release(7)

 r277253:
  Add 'list-vmtargets' target, which produces a list of all supported
  VM and cloud provider images.

  Add VHD_DESC, VMDK_DESC, QCOW2_DESC, RAW_DESC image descriptions.

  Format the output to make a bit more readable.

  Update release(7) to document the list-vmtargets target.

 r277263:
  Add initial support for the GCE (Google Compute Engine) cloud hosting
  provider image.

 r277264:
  Style and line length cleanup.

 r277383:
  Remove the console setting from rc.conf(5), which is not used there.
  While here, set console to include vidconsole in the loader.conf(5).

 r277384:
  Fix an indentation nit.
  No functional changes.

 r277393:
  Remove the pkg-clean(8) call from vm_extra_pre_umount() since the
  function is often overridden.

  Add vm_extra_pkg_rmcache() to call pkg-clean(8) to avoid duplicated
  code.

 r277394:
  Move resolv.conf(5) removal back to vm_extra_pre_umount() where it
  belongs.

  The GCE image needs resolv.conf(5) to exist (created as part of the
  image setup), so it cannot be removed.

 r277395:
  Comment the line that configures ttys(5) to 'off', which makes it
  impossible to test that the image boots.

  Add a note explaining why the line is commented, and not (yet) removed
  entirely.

 r277438:
  Move the 'install' bits that are specific to virtual machine images
  from the Makefile to Makefile.vm.

  Rename the 'install' target to 'release-install', and add a new
  'vm-install' target.

  Add a new 'install' target that invokes the new targets.

 r277439:
  Add WITH_CLOUDWARE to the list of make(1) variables for the release
  build.

 r277447:
  Remove hw.vga.textmode=1 from the VM image loader.conf, which was
  included during test builds and not intended to be included when
  merging this project branch back to head.

 r277455:
  Remove mk-azure.sh, which is no longer needed.

MFC after:	1 month
X-MFC-To:	stable/10 (requires mkimg(1))
Help from:	cperciva, swills
Relnotes:	yes
Sponsored by:	The FreeBSD Foundation