s1711: updated LdapConfig and unit tests

projects/cadcAccessControl-Server/build.xml

projects/cadcAccessControl-Server/config/.dbrc_example

...cts/cadcAccessControl-Server/config/LdapConfig.properties

...rol-Server/src/ca/nrc/cadc/ac/server/ldap/LdapConfig.java

...t/src/ca/nrc/cadc/ac/server/ldap/AbstractLdapDAOTest.java

...rver/test/src/ca/nrc/cadc/ac/server/ldap/LdapDAOTest.java

...test/src/ca/nrc/cadc/ac/server/ldap/LdapGroupDAOTest.java

.../test/src/ca/nrc/cadc/ac/server/ldap/LdapUserDAOTest.java

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

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

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