Remove getSelfCert and getPeerCert apis
Remove getSelfCert and getPeerCert apis

Summary:
Remove getSelfCert and getPeerCert APIs from
AsyncTransport.

This removes an explicit dependency on the X509 type
from openssl

Reviewed By: yfeldblum

Differential Revision: D14970297

fbshipit-source-id: b727789d3a37a57d4728709ab66a575d40176172

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