tests: Fix: Exclude test include YAML files from tests

tests: Fix: Exclude test include YAML files from tests

These partial YAML files are included as part of other test cases and
are not intended to be run as separate tests.

The tests run based on these partial files were still listed as passing
because currently the test system only checks that a test fails
configuration, but does not compare the reason for that failure with an
expected reason. Since all the included files are invalid partial
configurations, configuration generation would necessarily fail, and so
the test would "pass".

Change-Id: Iaea53b6ff1fa184d284079befe695f22ad53ef09
Signed-off-by: Erica Bugden <ebugden@efficios.com>