Fix module-level filtering in CompatibilityTest

Before this change, exclude filters (i.e. from cts-known-failures) were
discarded if:

- CompatibilityTest was invoked on one test
- CompatibilityTest was invoked on one module and an exclude filter for
that module didn't specify a test

bug:27873815
Change-Id: I2ef303c7af47e7b60f7ff0545bbc00e1ebf27083
2 files changed