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The hostname that was supplied when the socket was created is stored as
the "peerHostname"  This is the only one that should be used for Server
Name Indication (SNI) purposes.

The "peerHostname" or the resolved IP address may be used for
certificate validation, so keep the use of "getHostname()" for
cerificate validation.

Bug: 16658420
Bug: 17059757
Change-Id: Ifd87dead44fb2f00bbfd5eac7e69fb3fc98e94b4