- Remove syslog_server (Logstash provisioning is not ready yet).

- Set tls_ca_cert (for all machines) instead of extra_tls_certs (reflect change
  in common role).

group_vars/all

-syslog_server: logstash.ansible.vagrant
-extra_tls_certs: [ 'files/Ansible.vagrant/CA.crt' ]
+tls_ca_cert: files/Ansible.vagrant/CA.crt