Default to allowing partial test coverage

Currently, many test cases are not executed. A follow-up pull request will
take care of that. In the meantime, continue allowing partial test coverage.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>

tests/scripts/analyze_outcomes.py

@@ -13,7 +13,9 @@
 
 
 class CoverageTask(outcome_analysis.CoverageTask):
-    pass # We'll populate IGNORED_TESTS soon
+    # We'll populate IGNORED_TESTS soon. In the meantime, lack of coverage
+    # is just a warning.
+    outcome_analysis.FULL_COVERAGE_BY_DEFAULT = False
 
 
 # The names that we give to classes derived from DriverVSReference do not