Add more CTS tests.

These tests cover streaming mp3 over http, streaming the same file
again, streaming with a redirect, streaming with unknown content
length, streaming ogg vorbis, streaming ogg vorbis with redirect,
and streaming ogg vorbis with unknown content length.

Change-Id: I40b0dd5f7d1b44c2e27ab46bff5e0850d65e4776