storage UI patches

[David Cantrell <dcantrell redhat com>]

Two patches to fix problems with the partition editor dialog box.  For
regular partitions (i.e., not LVM and not RAID), users could not uncheck
'Format' once they selected it.  There were also some problems with UI
flow between format, migrate, and resize.  I've tried to clean that up
with these patches.

LVM and RAID partition editing will probably need some small changes to
go along with these changes, but I wanted to do those after these are
reviewed.

-- 
David Cantrell <dcantrell redhat com>
Red Hat, Inc. / Honolulu, HI