(MCO-98) Add tests for shipped agents

This commit adds tests for all the actions in the rpcutil agent.
Merge pull request #141 from ploubser/bug/master/mco-98

(MCO-98) Add tests for shipped agents
maint: update changelog
(MCO-146) mco ping logs bogus warning

When we added to ability to the client to log a warning when responses
received are less than responses expected we ignored the fact that
applications like ping expect 0 responses, meaning that ping would
always log a warning even when it is behaving normally.

The client receiver will now check if expected responses is greater than
actual responses before logging.
Merge pull request #142 from ploubser/bug/master/mco-146

(MCO-146) mco ping logs bogus warning