Add implementation for capabilities.

Code to actually implement Capsicum capabilities, including fileops and
kern_capwrap(), which creates a capability to wrap an existing file
descriptor.

We also modify kern_close() and closef() to handle capabilities.

Finally, remove cap_filelist from struct capability, since we don't
actually need it.

Approved by: mentor (rwatson), re (Capsicum blanket)
Sponsored by: Google Inc

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