[SCSI] hpsa: bring logical drives online when format completes

[SCSI] hpsa: bring logical drives online when format completes

Now that the driver is hiding logical drives which are
undergoing low level format (e.g. drive erase or rapid parity
initialization) from the OS, it should bring those drives online
when the operation completes.  We poll with test unit ready
every so often to determine when the drives become ready.

Signed-off-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>