TMDM-7618: "Error while clicking 'User Manager'"

Move getRolePKs from SE to EE interface (only used in EE).
Adds commons-lang dependency (build of webapp.core EE edition).
Code clean up in UserManagerAction (Removes unsed method, code format, local variables for repeated instantiations).
(https://jira.talendforge.org/browse/TMDM-7618)