Changed module names to lower-case and group to org.opencadc to conform to maven repo naming standards

small tweaks and fixes to get integration tests to pass; removed support for querying for other user memberships in GMSClient API

s1728: move WhoAmIServlet from ac_ws to cadcAccessControl-Server, put all servlets in the same package, fix unit tests.

catch GroupNotFoundException and return empty list, fix error content-type (text/plain), set logged success=true for handled exceptions

1651: updated RequestValidator for parameter name change, add exceptions to membership queries in GMSClient