Add unit test for create_server,list_addresses.

We have a plan to migrate service clients to tempest-lib from Tempest.
However, we are not doing enough tests for service clients now.
This patch adds unit test for create_server, list_addresses, list_address_by_network,
remove bytes_body parameter in delete_server

Change-Id: I5c2f73b87b033baa362360b6add6eabd02f54c38
1 file changed