- put some common code in a function handle_remount();

- add better checks on non-existing directories to prevent error
  messages at run time;
- introduce a function log() to help debugging diskless booting
  when things don't work;
- modify the parsing of diskless_remount so you can add mount_nfs
  options after the pathname. You could use 'remount' to do something
  similar, but this way is more convenient because you don't have to
  hardwire the server name in the command.
- document the above.

I have been running the above in a diskless lab since february on RELENG_6.

MFC after: 1 week

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