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/Suse.yml

@@ -0,0 +1,11 @@
+- name: Template repo
+  template:
+    src: virt.repo.j2
+    dest: /etc/zypp/repos.d/virt.repo
+
+- name: Install docker 17
+  zypper:
+    name: docker>=17
+    force: yes
+    disable_gpg_check: yes
+    update_cache: yes