Ticket 48303 - Fix lib389 broken tests
    
    List of fixes through all the test suites:
    - Remove SER_DEPLOYED_DIR assignment, because now it is
    in __init__.py by default.
    - Remove "Created on" block, because git contains this information.
    - Add Red Hat copyright block.
    - Add more logging.
    - Add more docstrings.
    - Fix the imports to the correct ones.
    - Fix expected exception assertions using pytest.raises.
    - Refactore code to the pytest compatibility.
    
    tests/dirsrv_test.py:
    - Refactor nearly whole test suite logic, because previous one
    didn't have the proper test coverage.
    
    tests/mappingTree_test.py:
    - Remove _add_user and _mod_user functions,
    because they are used nowhere.
    
    tests/replica_test.py:
    - Remove the test_delete test case, because replica.delete() is
    obsolete, use replica.enableReplication() instead.
    - Remove big block of commented code at the bottom.
    - Add tests to the test_disableReplication test case,
    now it is implimented.
    
    tests/utils_test.py:
    - Fix dictionary keys to the right ones, depends on what keys are
    expected in the source code. For example: 'newhost' to 'hostname'.
    
    https://fedorahosted.org/389/ticket/48303
    
    Review by: mreynolds (Thanks!)