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The global socket pool determines which socket can be reused by looking at the (is_ssl, host, port) tuple. The fact means that SSL connections connecting to the same host:port using different SSL_CTXs cannot be shared within the global socket.
This PR implements the restriction by making SSL_CTX part of the socket pool. The added bonus is that SSL handshake can now be completed within the socket pool.
amends #1434 #1476