Add server_name ACL matching server name(s) obtained from various sources such as...

Add server_name ACL matching server name(s) obtained from various sources such as CONNECT request URI, client SNI, and SSL server certificate CN.

During each SslBump step, Squid improves its understanding of a "true server
name", with a bias towards server-provided (and Squid-validated) information.

The server-provided server names are retrieved from the server certificate CN
and Subject Alternate Names. The new server_name ACL matches any of alternate
names and CN. If the CN or an alternate name is a wildcard, then the new ACL
matches any domain that matches the domain with the wildcard.

Other than supporting many sources of server name information (including
sources that may supply Squid with multiple server name variants and
wildcards), the new ACL is similar to dstdomain.

Also added a server_name_regex ACL.

This is a Measurement Factory project.