added another mock for test_spec.py for macro_expand
added another mock for test_spec.py for macro_expand

testing was failing if you didn't have rpm in your virtualenv

Added a mock to the test framework to avoid requiring rpm for testing
none of the test cases currently tested were impacted.

There is likely a possible issue but not exposed in any testing currently.

Change-Id: Id9fc0e57a63d54bd1ce526b197014fff42d189b0

openstack-packages/rdopkg,redhat-openstack/rdopkg,redhat-openstack/rdopkg,openstack-packages/rdopkg