Joachim Bauch 1b794d56b7 Switch to use SHA-256 for certificates / fingerprints.
This CL changes identity generation to use SHA-256 for the self-signed
certificates and the fingerprints sent in the SDP.

BUG=4602
R=juberti@google.com

Review URL: https://webrtc-codereview.appspot.com/47149004

Cr-Commit-Position: refs/heads/master@{#9173}
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