Remove getBytesRead and getBytesWritten from folly::AsyncSSLSocket.
Remove getBytesRead and getBytesWritten from folly::AsyncSSLSocket.

Summary: getRawBytesReceived and getRawBytesWritten should be used instead.

Reviewed By: mzlee

Differential Revision: D2708684

fb-gh-sync-id: 2de87dc2b8c3466f94293a3d7df89fc5fce3a00f

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