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

roles/etcd/tasks/configure.yml

@@ -45,6 +45,7 @@
     src: "etcd-{{ etcd_deployment_type }}.service.j2"
     dest: /etc/systemd/system/etcd.service
     backup: yes
+    mode: 0644
   when: is_etcd_master and etcd_cluster_setup
 
 - name: Configure | Copy etcd-events.service systemd file
@@ -52,6 +53,7 @@
     src: "etcd-events-{{ etcd_deployment_type }}.service.j2"
     dest: /etc/systemd/system/etcd-events.service
     backup: yes
+    mode: 0644
   when: is_etcd_master and etcd_events_cluster_setup
 
 - name: Configure | reload systemd
@@ -65,7 +67,7 @@
     name: etcd
     state: started
     enabled: yes
-  ignore_errors: "{{ etcd_cluster_is_healthy.rc == 0 }}"
+  ignore_errors: "{{ etcd_cluster_is_healthy.rc == 0 }}"  # noqa ignore-errors
   when: is_etcd_master and etcd_cluster_setup
 
 # when scaling new etcd will fail to start
@@ -74,7 +76,7 @@
     name: etcd-events
     state: started
     enabled: yes
-  ignore_errors: "{{ etcd_events_cluster_is_healthy.rc == 0 }}"
+  ignore_errors: "{{ etcd_events_cluster_is_healthy.rc != 0 }}"  # noqa ignore-errors
   when: is_etcd_master and etcd_events_cluster_setup
 
 - name: Configure | Wait for etcd cluster to be healthy
@@ -126,7 +128,7 @@
 - name: Configure | Check if member is in etcd cluster
   shell: "{{ bin_dir }}/etcdctl member list | grep -q {{ etcd_access_address }}"
   register: etcd_member_in_cluster
-  ignore_errors: true
+  ignore_errors: true  # noqa ignore-errors
   changed_when: false
   check_mode: no
   when: is_etcd_master and etcd_cluster_setup
@@ -142,7 +144,7 @@
 - name: Configure | Check if member is in etcd-events cluster
   shell: "{{ bin_dir }}/etcdctl member list | grep -q {{ etcd_access_address }}"
   register: etcd_events_member_in_cluster
-  ignore_errors: true
+  ignore_errors: true  # noqa ignore-errors
   changed_when: false
   check_mode: no
   when: is_etcd_master and etcd_events_cluster_setup