added cadcAccessControl unit tests

projects/cadcAccessControl/build.xml

projects/cadcAccessControl/src/ca/nrc/cadc/ac/AC.java

...s/cadcAccessControl/src/ca/nrc/cadc/ac/GroupProperty.java

...cts/cadcAccessControl/src/ca/nrc/cadc/ac/GroupReader.java

...cts/cadcAccessControl/src/ca/nrc/cadc/ac/GroupWriter.java

...ts/cadcAccessControl/src/ca/nrc/cadc/ac/GroupsReader.java

...cadcAccessControl/src/ca/nrc/cadc/ac/PersonalDetails.java

...ts/cadcAccessControl/src/ca/nrc/cadc/ac/PosixDetails.java

...cts/cadcAccessControl/src/ca/nrc/cadc/ac/UserDetails.java

...ects/cadcAccessControl/src/ca/nrc/cadc/ac/UserReader.java

...ects/cadcAccessControl/src/ca/nrc/cadc/ac/UserWriter.java

...adcAccessControl/src/ca/nrc/cadc/ac/client/GMSClient.java

...est/src/ca/nrc/cadc/ac/GroupPropertyReaderWriterTest.java

...essControl/test/src/ca/nrc/cadc/ac/GroupPropertyTest.java

...ontrol/test/src/ca/nrc/cadc/ac/GroupReaderWriterTest.java

.../cadcAccessControl/test/src/ca/nrc/cadc/ac/GroupTest.java

...rol/test/src/ca/nrc/cadc/ac/IdentityReaderWriterTest.java

...sControl/test/src/ca/nrc/cadc/ac/PersonalDetailsTest.java

...cessControl/test/src/ca/nrc/cadc/ac/PosixDetailsTest.java

...cessControl/test/src/ca/nrc/cadc/ac/ReaderWriterTest.java