core: clean up VDSGroup.equals()

VDSGroup.equals() was missing braces for many if statements.  During
cleanup, found it was also missing a return statement and thus didn't
properly compare description and high_utilization.

Change-Id: I1036db064d343ddc70ab49eeefa0e94e6d2b0f2e
Signed-off-by: Greg Padgett <gpadgett@redhat.com>