MFC r318546:
sys/fs/tmpfs/vnd_test: make md(4) allocation dynamic
The previous logic was flawed in the sense that it assumed that /dev/md3
was always available. This was a caveat I noted in r306038, that I hadn't
gotten around to solving before now.
Cache the device for the mountpoint after executing mdmfs, then use the
cached value in basic_cleanup(..) when unmounting/disconnecting the md(4)
device.
Apply sed expressions to use reuse logic in the NetBSD code that could
also be applied to FreeBSD, just with different tools.
git-svn-id: svn://svn.freebsd.org/base/stable/10@319007
ccf9f872-aa2e-dd11-9fc8-
001c23d0bc1f