tport_type_tls.c:
* tport_tls_accept():
  - Replaces tport_accept for incoming TLS connections.
* tport_tls_connect():
  - Replaces tport_base_connect() for outgoing TLS connections.

tport_tls.c:
* tls_t now use a memory home instead of malloc.
* removed tls_check_hosts()
* tls_connect():
  - Replaces tport_base_connect for TLS connection setup.
  - Completes TLS handshake and verifies peer certificates.
  - Destroys suspect TLS connections before sending/receiving payload.
  - Populates a su_strlst_t with subjects from the peer certificate.

tport.c:
* tport_is_verified()
  - true if peer certificate validated successfully
* tport_delivered_from_subjects()
  - Certificate subjects listed in the peer certificate.

darcs-hash:20081216221937-2152f-3d6b74d411b57c22230e4840fca133da48c86368.gz