s1651: updated unit tests

projects/cadcAccessControl-Server/build.xml

.../test/src/ca/nrc/cadc/ac/server/RequestValidatorTest.java

...c/ca/nrc/cadc/ac/server/web/AddGroupMemberActionTest.java

...rc/ca/nrc/cadc/ac/server/web/AddUserMemberActionTest.java

.../src/ca/nrc/cadc/ac/server/web/DeleteGroupActionTest.java

.../test/src/ca/nrc/cadc/ac/server/web/GroupsActionTest.java

...a/nrc/cadc/ac/server/web/RemoveGroupMemberActionTest.java

...ca/nrc/cadc/ac/server/web/RemoveUserMemberActionTest.java

...trol/src/ca/nrc/cadc/ac/MemberAlreadyExistsException.java

...ssControl/src/ca/nrc/cadc/ac/MemberNotFoundException.java

...ntrol/test/src/ca/nrc/cadc/ac/GroupsReaderWriterTest.java

...s/cadcAccessControl/test/src/ca/nrc/cadc/ac/RoleTest.java