Task #8571: Added python 2.6 compatibility for nested with-statement

LCS/Messaging/python/messaging/test/t_RPC.py

@@ -6,6 +6,8 @@ that the functions are OK. Next the same tests are done with the RPC and
 Service classes in between. This should give the same results.
 """
 import sys
+from contextlib import nested
+
 from lofar.messaging import Service, RPC
 
 class UserException(Exception):
@@ -117,7 +119,7 @@ if __name__ == '__main__':
     serv5 = Service(busname, "DictService",      DictFunc,      numthreads=1)
 
     # 'with' sets up the connection context and defines the scope of the service.
-    with serv1, serv2, serv3, serv4, serv5:
+    with nested(serv1, serv2, serv3, serv4, serv5):
         # Start listening in the background. This will start as many threads as defined by the instance
         serv1.StartListening()
         serv2.StartListening()