fix crash issue while playing certain streaming media

In the play response of certain streaming media, the url just contains part of the full url.
Change the url matching method to enable this case rather than crash as before.

Change-Id: Ide4a4a3f01120f9092193a765bda1cc9f12daf56
Author: Yi Wang <yi.a.wang@intel.com>
Signed-off-by: Yi Wang <yi.a.wang@intel.com>
Signed-off-by: Shuduo Sang <shuduo.sang@intel.com>
Signed-off-by: Shuo Gao <shuo.gao@intel.com>
Signed-off-by: Bruce Beare <bruce.j.beare@intel.com>
Signed-off-by: Jack Ren <jack.ren@intel.com>
Author-tracking-BZ:49305, 18533, 7540
Fix timestamp anchor problems for RTSP

Correctly set the media anchors for RTSP when seeking, pausing
and starting. Both when using sender reports or when using
fake timestamps. The timestamps are used when synchronizing the
audio and video streams.

The timestamps calculated in MyHandler using RTSP Sender Reports were
overwritten at a later stage in RTSPSource. This commit also removes
the code that writes over the existing timestamps and instead uses
the timestamps calculated in MyHandler.

Change-Id: Idd238df5ebeef2d2a7da03730cb4a70445a2339d