Fix broken CtsVerifierReportLog handling.

Fix incorrect type-cast in test end handler
Replaced (only inadvertently working) mechanism
for storing ReportLog results with explicit handling.
Implement 'final' method(s) for generating ReportLog filename.

Bug: 186561084
Bug: 186720548

Test: build, install, run AudioTests, Streaming Video Test...
Change-Id: Ib69b48d1499c5cd0a74918ac82444b70f5599479
Merged-In: Ib69b48d1499c5cd0a74918ac82444b70f5599479
1 file changed