Handle failures from Before/AfterClass in the runner

- Failures from @BeforeClass / @AfterClass are not properly handled
by tradefed (at least by IsolatedHostTest).

- So let's detect them and propagate failures as if each tests reported
the failure, which is a workaround that tradefed uses in a different
host test runner.

- Also, change the lambdas RavenwoodAwareTestRunner to inner classes,
so that the stacktrace would be less cryptic.

Flag: EXEMPT host test change only
Bug: 364395552
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh

Change-Id: I55299d19cd07af2fcfe71ff93b31a5b401e799e4