bigfin: Consider next 2's power if pgnum < osd count
bigfin: Consider next 2's power if pgnum < osd count

If calculated pgnum value is less than no of OSDs
consider next 2's power as pgnum.

Change-Id: Ie5cd92f237013e2f2bcae615c4173da3945e2fdf
Signed-off-by: Shubhendu <abf833e62503b33bb0dfae62bb381d87d91f8de1@redhat.com>

skyrings/bigfin,skyrings/bigfin,skyrings/bigfin