More precise test summary

Now ravenwood-test-summary *should* match the atest output -- unless
the test uses junit3 based tests, or @NoRavenizer.

Flag: EXEMPT host test change only
Bug: 292141694
Test: $ANDROID_BUILD_TOP/frameworks/base/ravenwood/scripts/run-ravenwood-tests.sh
    and run ./scripts/ravenwood-test-summary
    Also do this after breaking a test
Change-Id: I3c5c67416ff9f1eca0c194485b366741bd0829e8