Bug#947811: systemd: don't check *mounted* filesystems by default

[Joshua Hudson]

I had to use fsck.mode=force to get it to reproduce on the very next
boot. Otherwise, it reproduces sporadically. I don't want to
deliberately crash the system badly enough to get it to really need to
fsck the next boot.

Reduced logs:

Dec 31 08:42:05 nova kernel: Command line: BOOT_IMAGE=Lin ro
root=/dev/mapper/isw_cfbejbfeib_Volume11 video=960x540 fsck.mode=force
Dec 31 08:42:05 nova kernel: Kernel command line: BOOT_IMAGE=Lin ro
root=/dev/mapper/isw_cfbejbfeib_Volume11 video=960x540 fsck.mode=force
Dec 31 08:42:05 nova kernel: Adding 33554428k swap on
/dev/mapper/isw_cfbejbfeib_Volume12.  Priority:-2 extents:1
across:33554428k FS
Dec 31 08:42:08 nova systemd[1]: Condition check resulted in
/dev/mapper/isw_cfbejbfeib_Volume12 being skipped.
Dec 31 08:42:08 nova dmraid-activate[579]: ERROR: Cannot retrieve RAID
set information for isw_cfbejbfeib_Volume1
Dec 31 08:42:08 nova dmraid-activate[572]: ERROR: Cannot retrieve RAID
set information for isw_cfbejbfeib_Volume1
Dec 31 08:42:09 nova systemd[1]: Condition check resulted in
/dev/mapper/isw_cfbejbfeib_Volume13 being skipped.
Dec 31 08:42:09 nova systemd[1]: Starting File System Check on
/dev/mapper/isw_cfbejbfeib_Volume13...
Dec 31 08:42:09 nova systemd[1]: Started File System Check on
/dev/mapper/isw_cfbejbfeib_Volume13.
Dec 31 08:42:15 nova systemd[1]: Condition check resulted in
/dev/mapper/isw_cfbejbfeib_Volume14 being skipped.
Dec 31 08:42:15 nova systemd[1]: Starting File System Check on
/dev/mapper/isw_cfbejbfeib_Volume14...
Dec 31 08:42:15 nova systemd[1]: Started File System Check on
/dev/mapper/isw_cfbejbfeib_Volume14.

e2fsck complains on the console about Volume14 being mounted, but
there's no trace in the logs.

Note that I have to mount everything in /sbin/init before handing off
to systemd because otherwise it waits for the raid controller
containing / to come up so it can mount it read-write (makes no
sense--/ is already up by definition).
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