fix postgresl-fts indexer: get_indexer reported not implemented When I implemented postgresql fts indexing I forgot to remove code that raised NotImplemented when it was requested. Also had to fix import to match filename. Added tests for native-fts paths in get_indexer.

try:
    # Python 3+.
    from xmlrpc import client, server
    server.SimpleXMLRPCDispatcher
except (ImportError, AttributeError):
    # Python 2.
    import xmlrpclib as client  # noqa: F401
    import SimpleXMLRPCServer as server