This patch finalizes the switch to port 587 for email submission that
was started with commit 166c57.

This merge reinstates the webmail role lost when we moved to Jessie. The carddav, managesieve, and twofactor_gauthentication plugins are carried forward.

- managesieve :: this allows sieve filters to be edited through a
  brower
- twofactor_gauthenticator :: allow optional two-factor authentication
  when logging into webmail
- carddav :: sync ownCloud contacts with roundcube

Allow SSH agent forwarding when using sudo.  This allows one to use SSH agent forwarding from a local machine when logged in as a root on the Sovereign server.  This is useful, for example, for cloning a Github repository to /var/www (owned by root) without the need to store private SSH keys on the Sovereign server.

Baseline the configuration file distributed Roundcube 1.4.1 before
modification for sovereign.

The rmilter package changed the name of its listener service similar to
what was done for rspamd (see commit 2dbc976b).

Update Rspamd setup

Fix SSH connections to Github

The `private_key` variable used to check for changes was never
registered.

Use submission port for client outgoing email

Eliminate need for access_compat module in Apache

Remove duplicate when statement in Let's Encrypt task

While adding the Let's Encrypt offline testing block in 1746afcc we
accidentially duplicated a the 'when' statement. Ansible only looks at
the last when statement for a given block meaning the earlier one has no
use. This commit merges both lines in one.

Update testing to work with modularized Sovereign

* Harvest testing configuration into group variables
* Define testing group for Vagrant to use
* Move testing passwords to secrets directory that Vagrant uses
* Update .gitignore to keep the testing secrets

VPN - enforce TLS min version on the client

The directives provided by `mod_access_compat` are deprecated.  This
patch eliminates references to them.

Currently client email is submitted via ssmtp (port 465).  This has been
deprecated for years.  The correct way to submit email is via
submission (port 587).

This patch adds port 587 as a second and the default way of submitting
email for delivery.  Port 465 remains open for backwards compatibility
with existing clients.

Modularize sovereign

Add missing configuration parameter for ircbouncer

DOC: sudo is not installed by default on jessie

news role: add missing restart apache handler

All of the variables need to be set.