1b794d56b72853fe2eecbea2c719886c44578ed8

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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