[WFLY-3010] Map the groups from JAAS to the groups used within realms.
[WFLY-3010] The XML parser has always supported the choice being missing, just ensuring this is correctly reflected where the authorization element could contain an attribute value.
[WFLY-3010] Port changes to version 3 of the schema instead of version 2.1
[WFLY-3010] Change the default value comparison to a String comparions to allow for expressions.
Merge pull request #6269 from darranl/WFLY-3010/master_again

[WFLY-3010] Allow re-use of groups loaded by JAAS based authentication.