EXOGTN-1289: PicketLink : membership duplication

Problem analysis
	-  ignoreMappedMembershipType parameter which makes the mapping between "member" and "JBOSS_IDENTITY_MEMBERSHIP" doesn't work
        -  Because memberships can be obtained from DB and LDAP, the membership is duplicated

Fix description
	- Specify groups whose membership will ignore mapping
	- Provide parameter to skip storing membership in PLIDM which improves performance in case of not using LDAP