update ansible, disable mitgen and ara per default and fix pipelining

defaults/main.yaml

@@ -1,11 +1,11 @@
-ansible_version: 5.2.0
+ansible_version: 6.4.0
 ansible_pip_package: ansible
 
-ansible_use_ara: true
+ansible_use_ara: false
 ansible_ara_version: 1.5.7
 ansible_ara_pip_package: ara[server]
 
-ansible_use_mitogen: true
+ansible_use_mitogen: false
 ansible_mitogen_version: 0.3.2
 ansible_mitogen_pip_package: mitogen
 

templates/ansible.cfg.j2

@@ -19,8 +19,6 @@ strategy = mitogen_linear
 {% endif %}
 
 [ssh_connection]
-{% if not ansible_use_mitogen %}
 {% if ansible_use_ssh_pipelining %}
 pipelining = True
 {% endif %}
-{% endif %}