[PATCH] ftp_epsv acls

This patch add support for ftp_epsv ACLs. The following syntax is supported:
  ftp_epsv on
  ftp_epsv off
  ftp_epsv deny acl1
  ftp_epsv allow acl2 acl3

The action of the first matching line wins. The "ftp_epsv on|off" syntax
is supported for backward compatibility and it is equivalent to ftp_epsv
allow|deny all.
Mixing legacy and new ACLs configuration is not allowed.

I must note that the server side EPRT and PORT ftp commands, when they
are used causes crashes to squid (eg when setting the "ftp_passive
off"). This patch does not try to support ACLs for ftp_eprt.

This is a Measurement Factory project