Add a flag `force' (VF_FORCECONFIG) to force name changes of
existing drives.
config_drive:
If the drive already has a vinum label, and name doesn't match the
specified drive, do it anyway if the 'force' flag is specified.
finish_config:
Reset the `force' flag.
Continually-tripped-over-by: Karl Pielorz <kpielorz@tdx.co.uk>
give_sd_to_drive:
If the drive is down, take the subdisk down and don't try to fix
things.
update_plex_config:
Don't try to update the config parameters of a plex which isn't
fully configured (state plex_init or plex_unallocated).
Correctly calculate the amount to trim off a striped or RAID-5 plex
whose size is not a multiple of the stripe size.