object-storage: Fixing the errors and warnings in unittest.

Change-Id: Id22c968aefd82c4b62445b3ecc93cbabc2b35ffc
BUG: 887301
Signed-off-by: Mohammed Junaid <junaid@redhat.com>
Reviewed-on: http://review.gluster.org/4394
Reviewed-by: Kaleb KEITHLEY <kkeithle@redhat.com>
Reviewed-by: Peter Portante <pportant@redhat.com>
Tested-by: Gluster Build System <jenkins@build.gluster.com>