tests: Regression test with wrong LC_ALL
    
    Ticket:
    https://fedorahosted.org/sssd/ticket/2785
    
    Test local domain tool with wrong LC_ALL
    environment variable value.
    
    NOTE: The memory cache files are not deleted
    properly in the test teardown to work around the
    problem described in ticket
    https://fedorahosted.org/sssd/ticket/2726
    
    Once the ticket above is solved, the teardown
    will be updated to remove the memory cache
    files.
    
    Reviewed-by: Michal Židek <mzidek@redhat.com>