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/cri-o.yml

@@ -1,4 +1,5 @@
 ---
+
 - name: stat the expected cri-o directory
   stat:
     path: "{{ ansible_env.GOPATH }}/src/github.com/kubernetes-incubator/cri-o"
@@ -75,4 +76,4 @@
     insertafter: 'storage_option = \['
     regexp: 'overlay2\.override_kernel_check=1'
     state: present
-  when: ansible_distribution == 'RedHat' or ansible_distribution == 'CentOS'
+  when: ansible_distribution == 'RedHat' or ansible_distribution == 'CentOS'