Remove unsupported executable parameter from command task

Consolidate postfix tasks for master.cf and main.cf

Remove deprecated host and http_host settings from robot configuration

Remove remains of check_smtp feature.

Combine plays for common and sympa roles

Running separate plays prevents role variables from being visible in other roles. This is a first step to implement #46.

Also move the Postfix snippet for sympa from sympa role to postfix role.

See also: https://github.com/sympa-community/sympa/pull/916

Use standard colors

Update Sympa version to 6.2.54

Fix "usefull" typo.

Fix redirect from / to /sympa

Currently it doesn't work at all. Also it changes the same files twice by
different tasks which is a really bad idea.

Using tests as filters is deprecated

This causes failure of the "Check Ansible version" task.

Fix wrong heading "Sympa patchs".

Turn off SOAP service by default (#60).

Improve task for creating Sympa log file.

Use proper directory "/etc/systemd/system" for systemd unit files

"/lib/systemd/system" is reserved for packages installed by the distribution.

Update Sympa version to 6.2.52

Update Sympa version to 6.2.50

Remove stray groupware redirect from Apache template

Make Sympa SOAP service optional (#60)

Add missing configuration for tmpdir location

Use YAML callback plugin.