Adjust cipher suite assertions to match what's currently reported by the
server.

Remove WebTests.test_znc_http test since ZNC web interface isn't exposed to
the Internet.

(Tested only with Debian 7 VM from the Vagrantfile)

added dovecot-pop3d
allowed in the firewall
monitored with monit
added relevant tests

See #121

Added friendly_networks variable to denote whitelisted networks