s1738: add get and update support to gmslcient, bug fix in GroupsActionFactory to not allow a -1 port in an url, added unit and int test

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

check that subject did not change since creating SSLSocketFactory in GMS clients, change VOSpaceAuthorizer to call both CADC and CANFAR GMS services