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This CL removed the incorrect comment in QuicTest, and
added a second unit test to make sure addQuicHints
works for the new async API.

It made QuicTestServer install test files during start up
to match the new behavior of NativeTestServer, and adds an
assertion to make sure the server has test data.

The CL caches the result returned by
CronetTestActivity#getContextConfig, so we don't
need to go through that path for initializing
mUrlRequestContext, mHttpUrlRequestFactory and
mStreamHandlerFactory, and cleaned up log statements.

Review URL: https://codereview.chromium.org/1138493002

Cr-Commit-Position: refs/heads/master@{#329678}