API spec filtering unit test fix.
Strip prefix using pre-python 3.9 method. Used in a python 3.8 pipeline, this method would fail.
Fix case when filtering on prefix only. Not used in practical cases, but should be supported.
Strip prefix using pre-python 3.9 method. Used in a python 3.8 pipeline, this method would fail.
Fix case when filtering on prefix only. Not used in practical cases, but should be supported.