Taylor Brandstetter 4256df09bf Make CNAME optional.
Before this change, lack of a CNAME results in losing all SSRC
information. This isn't necessary; we don't even use the CNAME for
anything on the receiving side.

Note that lack of a CNAME is technically a violation of
https://tools.ietf.org/html/rfc5576#section-6.1.

Bug: webrtc:10385
Change-Id: If9836b6c518367b29ffa1fb00752e52d51915d37
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/168581
Commit-Queue: Taylor <deadbeef@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#30552}
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