Add test case for 'call' and 'cast' for rpcclient
Add test case for 'call' and 'cast' for rpcclient

This patch adds test cases for the 'call' and 'cast' methods in the
rpc_client module.

Change-Id: I051a2b37648acd8ba4261d4f3e54d74964b10ad7

openstack/senlin,stackforge/senlin,Alzon/senlin,tengqm/senlin-container,tengqm/senlin-container,stackforge/senlin,Alzon/senlin,openstack/senlin,openstack/senlin