TESTS: Unit tests can use confdb without using sysdb
    
    Previously, if a test used the utility functions for setting up a test,
    it had to use both sysdb and confdb. Some unit tests only need to use of
    of them, for example the unit tests for the server module only need
    confdb.
    
    Reviewed-by: Pavel Reichl <preichl@redhat.com>