integration: Use vars_files in plays

It's unsightly and hard to maintain collections of references and long
lists across multiple playbooks/include files.  Centralize them all
in ``vars.yml``, then include that in all plays.

Minor: Update all files with a newline at the start and end.

Signed-off-by: Chris Evich <cevich@redhat.com>

contrib/test/integration/build/kubernetes.yml

@@ -1,4 +1,5 @@
 ---
+
 - name: clone kubernetes source repo
   git:
     repo: "https://github.com/runcom/kubernetes.git"
@@ -58,4 +59,4 @@
     dest: /etc/environment
     line: 'KUBECONFIG=/var/run/kubernetes/admin.kubeconfig'
     regexp: 'KUBECONFIG='
-    state: present
+    state: present