Disable SSLv3 in Dovecot imap server to avoid POODLE vulnerability

The previous behaviour relied on managesieve copying over the
.dovecot.sieve file into the user's directory. I found this to be
particularly fragile. For instance, re-deploying roundcube without
dovecot could overwrite the .dovecot.sieve symlink and break
managesieve.

A better approach is to use the global sieve configuration that
roundcube provides and not mess with dovecot's files directly.

Fixes issue #8. Adds new variable mail_header_privacy, on by default.
Installs postfix-pcre unconditionally, and then copies the pcre file
over and adds the header check to main.cf based on the variable value.
“this header replacement works great, but it logs that the replacement
has been done, which means that you are storing this information,
unless you are anonymizing your logs”

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

This allows the `recipient_delimiter` setting in etc_postfix_main.cf.j2
to function as intended.

Fixes: #121

Signed-off-by: PajamaSoft <support@pajamasoft.com>

These are the changes necessary to enable Roundcube's manage sieve plugin to mange server-side sieve filters.

Signed-off-by: PajamaSoft <support@pajamasoft.com>

Adds/subscribes Drafts, Sent, Junk, Trash and Archive mailboxes.

Fix CAcert usage in postfix and dovecot