core: avoid failover on setVolumeDescription default fail

failues when executing setVolumeDescription shouldn't
trigger the spm failover.

Change-Id: I1db19b03e53ddaa17a941c373668f157b75665b9
Bug-Url: https://bugzilla.redhat.com/show_bug.cgi?id=1126782
Signed-off-by: Liron Aravot <laravot@redhat.com>