K 10
svn:author
V 8
cperciva
K 8
svn:date
V 27
2015-03-30T08:33:19.542961Z
K 7
svn:log
V 491
Clean up filesystem unmounting in vmimage builds:
* Remove vm_umount_base function which is currently unused.
* Add umount_loop function which loops attempting to unmount one filesystem.
* Replace calls to umount with calls to umount_loop.
* Don't attempt to unmount ${DESTDIR}/dev if it isn't mounted.

The looping is necessary because sometimes umount fails due to filesystems
being busy.  The most common cause of such busyness is periodic(8) jobs
running `find / ...`.

Reviewed by:	gjb

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