SW-818: use factory method TBBRPC.create() to create a TBBRPC

MAC/Services/TBB/TBBClient/lib/tbbservice_rpc.py

@@ -80,7 +80,7 @@ if __name__ == '__main__':
     logging.basicConfig(format='%(asctime)s %(levelname)s %(message)s',
                         level=logging.INFO)
     import pprint
-    with TBBRPC() as rpc:
+    with TBBRPC.create() as rpc:
         import time
         from lofar.mac.tbb.tbb_util import expand_list
         logger.info(rpc.start_datawriters(output_path=None, num_samples_per_subband=None))