Remove unused `paramiko`
Remove unused `paramiko`

As `paramiko` is not needed in our test code, better remove it from
requirements to reduce dependency.

Change-Id: I77d191cdc249a19fa7aaf1f55ebfdbbd06927692

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