properly query for group definitions in case we try to purge them when removed from plugin
canned dg expressions: validate unique expr id within plugin
[BZ 1069544] (JON3-5) Create pre-defined DynaGroup expressions for EAP 6
groups/domains/...

Added 3 expressions. First groups managed servers by server-group name
(deploys DG) 2nd groups managed servers by hostname (aka domain) (deploys
DG) 3rd groups enabled deployments per server-groups