First fast-sni implementation

First fast-sni implementation

Squid parses incomming client SSL hello mesage, before create any openSSL
related structures and objects. After acl check at bumping step2.
Actually creating openSSL objects for client side still can be delayed
untill the server side is finishes. The only reason to create openSSL
structures imediatelly after step2 is to use openSSL to check for unsupported
comunications features and settings and fallback to spliceOnError.

Regression:
  Squid does not parses client Hello message in the case of bump-server-first
  and bump-client-first.
  The supported and requested SSL versions (i %ssl::>received_supported_version
  and %ssl::>received_hello_version formating codes ) can not be logged for
  these modes.

The code still needs cleanup.