services are broken in multiple ways

[dirk-thomas]

• add_two_ints_server__rmw_opensplice_cpp / add_two_ints_client__rmw_opensplice_cpp: the server receives additional uninitialized requests
• test_replier_cpp__rmw_opensplice_cpp / test_requester_cpp__rmw_opensplice_cpp has the same problem - the test does not cover that (even with update test to catch repeated service callbacks system_tests#34) since the client succeeds
• add_two_ints_server__rmw_connext_cpp / add_two_ints_client__rmw_connext_cpp do not exchange any messages
• add_two_ints_client__rmw_connext_cpp can't be stopped with Ctrl-C
• same for Connext dynamic

[esteve]

I've created three tickets to track these issues, thanks for testing these cases. I wonder what may have changed, the latter two examples used to work fine and I hadn't seen the first issue, but I can reproduce these issues on my local machine. I created a branch with tests to exercise some of these cases: https://github.com/ros2/system_tests/tree/test-services