rbd: don't move requests to the running list on errors
JIRA: https://issues.redhat.com/browse/RHEL-21939
Signed-off-by: Ilya Dryomov idryomov@redhat.com
JIRA: https://issues.redhat.com/browse/RHEL-21939
Signed-off-by: Ilya Dryomov idryomov@redhat.com