[EAP6-121] synch up with GC bzs
Merge pull request #6014 from aogburn/EAP6-121

[EAP6-121] synch up with GC bzs
Merge pull request #6016 from emuckenhuber/other

[WFLY-3078] also marshal directory-grouping if no servers are configured
WFLY-3060 - Rare KrbException: Request is a replay issue in negotiation tests
WFLY-2910 json.pretty on REST management has no effect
Minor - remove unnecessary dependency on Weld's internal class
[WFLY-3008] missing system property resolution for interface criteria
[WFLY-3000] set application/json as content-type
[WFLY-3008] fix rbac domain test configurations
[WFLY-3043] Cleanup messaging XML configuration

Remove elements from the messaging XML configuration that are defined
using the default values from the corresponding management model
attributes.

JIRA: https://issues.jboss.org/browse/WFLY-3043
[WFLY-3051] Add a dependency on 'javax.api' to the 'org.wildfly.extension.io' module.
fetch files only if they are actually required