Miscellaneous multipath bugfixes

Miscellaneous multipath bugfixes

This is mostly a cleanup of some bugs that recently got introduced. In
ACT_RESIZE we were trying to create a read-only device before we tried
to create a read/write one (I also added the ability to fail back to
read-only in ACT_RELOAD).  There were some printouts that I assume were
for debugging, and some duplicate code.  And I switched it so that
dm_simplecmd_flush did flushing, and dm_simplecmd_noflush didn't.

Signed-off-by: Benjamin Marzinski <bmarzins@redhat.com>