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/e2e.yml

@@ -1,4 +1,5 @@
 ---
+
 - name: enable and start CRI-O
   systemd:
     name: crio
@@ -31,11 +32,6 @@
   retries: 100
   delay: 30
 
-- name: Buffer location for e2e output and reports
-  set_fact:
-      # N/B: This need manual coordination with results.yml
-      artifacts: "{{ ansible_env.GOPATH }}/src/k8s.io/kubernetes/artifacts"
-
 - name: ensure directory exists for e2e reports
   file:
     path: "{{ artifacts }}"