Docker integration tests: factorize setup (#42306)

* Factorize docker_secret & docker_swarm tests setup

* failure are only expected inside docker container

* docker_swarm: enable RHEL builds

test/integration/targets/setup_docker/tasks/Debian.yml

@@ -0,0 +1,57 @@
+- name: Get OS version
+  shell: uname -r
+  register: os_version
+
+- name: Install packages for Trusty
+  apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: yes
+  with_items:
+  - "linux-image-extra-{{ os_version.stdout }}"
+  - linux-image-extra-virtual 
+  when: ansible_distribution_release == 'trusty'
+
+- name: Install pre-reqs
+  apt:
+    name: "{{ item }}"
+    state: present
+    update_cache: yes
+  with_items:
+  - apt-transport-https
+  - ca-certificates
+  - curl
+  - software-properties-common
+
+- name: Add gpg key
+  shell: curl -fsSL https://download.docker.com/linux/ubuntu/gpg >key && apt-key add key
+
+- name: Add Docker repo
+  shell: add-apt-repository "deb [arch=amd64] https://download.docker.com/linux/ubuntu $(lsb_release -cs) stable"  
+
+- block:
+    - name: Prevent service restart
+      copy:
+        content: exit 101
+        dest: /usr/sbin/policy-rc.d
+        backup: yes
+        mode: 0755
+      register: policy_rc_d
+
+    - name: Install Docker CE
+      apt:
+        name: docker-ce
+        state: present
+        update_cache: yes
+  always:
+    - name: Restore /usr/sbin/policy-rc.d (if needed)
+      command: mv {{ policy_rc_d.backup_file }} /usr/sbin/policy-rc.d
+      when:
+        - "'backup_file' in policy_rc_d"
+
+    - name: Remove /usr/sbin/policy-rc.d (if needed)
+      file:
+        path: /usr/sbin/policy-rc.d
+        state: absent
+      when:
+        - "'backup_file' not in policy_rc_d"