Move to Ansible 3.4.0 (#7672)

* Ansible: move to Ansible 3.4.0 which uses ansible-base 2.10.10

* Docs: add a note about ansible upgrade post 2.9.x

* CI: ensure ansible is removed before ansible 3.x is installed to avoid pip failures

* Ansible: use newer ansible-lint

* Fix ansible-lint 5.0.11 found issues

* syntax issues
* risky-file-permissions
* var-naming
* role-name
* molecule tests

* Mitogen: use 0.3.0rc1 which adds support for ansible 2.10+

* Pin ansible-base to 2.10.11 to get package fix on RHEL8

ansible_version.yml

@@ -4,6 +4,7 @@
   become: no
   vars:
     minimal_ansible_version: 2.9.0
+    minimal_ansible_version_2_10: 2.10.11
     maximal_ansible_version: 2.11.0
     ansible_connection: local
   tasks:
@@ -16,6 +17,17 @@
       tags:
         - check
 
+    - name: "Check Ansible version > {{ minimal_ansible_version_2_10 }} when using ansible 2.10"
+      assert:
+        msg: "When using Ansible 2.10, the minimum supported version is {{ minimal_ansible_version_2_10 }}"
+        that:
+          - ansible_version.string is version(minimal_ansible_version_2_10, ">=")
+          - ansible_version.string is version(maximal_ansible_version, "<")
+      when:
+        - ansible_version.string is version('2.10.0', ">=")
+      tags:
+        - check
+
     - name: "Check that python netaddr is installed"
       assert:
         msg: "Python netaddr is not present"