Story 1965. Fixed some javadoc warnings.

...ity/src/main/java/ca/nrc/cadc/auth/ACIdentityManager.java

...src/main/java/ca/nrc/cadc/ac/server/GroupPersistence.java

...rc/main/java/ca/nrc/cadc/ac/server/ldap/LdapGroupDAO.java

...java/ca/nrc/cadc/ac/server/ldap/LdapGroupPersistence.java

...ss-control/src/main/java/ca/nrc/cadc/ac/PosixDetails.java

cadc-access-control/src/main/java/ca/nrc/cadc/ac/User.java

...ontrol/src/main/java/ca/nrc/cadc/ac/client/GMSClient.java