EZP-21703: added validation of role limitations
EZP-21703: tested assignRoleToUser() and assignRoleToUserGroup()
EZP-21703: improved validation by adding pathString comparison
Merge pull request #552 from ezsystems/fix-EZP-21703-limitation-validation

Fix EZP-21703: RoleService does not validate Limitations in assignRoleToUser() and assignRoleToUserGroup() methods