roles/postgres: Create a new postgres_ssl_hosts variable that will be used to determine which hosts can login using ssl

roles/archweb: Memcached service.
roles/postgresql: Initial work on SSL support.

roles/archweb: Make archweb install and use it's own memcached service, running as the archweb user and using a socket.

This boils down to changing the comments and commenting things that are
default anyway, to reduce the distance to the packaged config.

roles/postgres: Added default values to the max_connections and shared_buffers variables.

roles/security-tracker: Idempotency fix. No need to enable and start a service when it is started by a timer.

playbooks/apollo: Added the sudo role and the security_tracker role. Also changes the posgres to include the new variables.
roles/postgres: Merged the new configuration (from 9.6) and added two new variables for making it easier to test the role on a vm/container.

roles/security-tracker: changed the secret key and added a initial make setup that creates the database.

Signed-off-by: Florian Pritz <bluewind@xinu.at>

Signed-off-by: Florian Pritz <bluewind@xinu.at>

Signed-off-by: Florian Pritz <bluewind@xinu.at>

This reverts commit 4e0074f177622cf825c343b63db5d1b51b1ec9f4.

The commit also adds the phpinfo role for testing purposes.

I don't use that machine to do Arch stuff; no need to have its key here.

Signed-off-by: Florian Pritz <bluewind@xinu.at>