Expand info callback support for TLSv1.3

Expand info callback support for TLSv1.3

During the TLSv1.3 handshake, update the legacy state and call the
info callback at the appropriate moment.  This is done by mapping
the TLSv1.3 states to the states in the old state machine whenever
that is possible. The callbacks are called at the beginning and end
of the handshake, and just before the state machine advances.

This should fix a periodic warning in logs of tor relays about a
variable that wasn't set although it should have been.

input/ok jsing, ok inoguchi (early version)