SSL Server connect I/O timeout

SSL Server connect I/O timeout

FwdState::negotiateSSL() operates on a TCP connection without a timeout. If,
for example, the server never responds to Squid SSL Hello, the connection get
stuck forever. This happens in real world when, for example, a client is trying
to establish an SSL connection through bumping Squid to an HTTP server that
does not speak SSL and does not detect initial request garbage (from HTTP point
of view)

This patch adds support for timeout to SSL negotiation procedure and sets this
timeout so that it does not exceed peer_connect or forward_timeout.

This is a Measurement Factory project