Joachim Bauch 37bb54eb20 Reland: Remove global list of SRTP sessions.
Instead save a reference to the SrtpSession inside the srtp_ctx_t.

The original CL was https://codereview.webrtc.org/1416093010 and
should be good to reland now that internal projects are using a
more recent version of libsrtp.

BUG=webrtc:5133
R=mattdr@webrtc.org, pthatcher@webrtc.org

Review URL: https://codereview.webrtc.org/2109893002 .

Cr-Commit-Position: refs/heads/master@{#13318}
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