Fix download_run_once for containers

Add one more step (task) to containers download/upload sequence -
copy saved .tar containers to ansible host (delegate_to: localhost).

Then upload images to target nodes. It uses synchronize module so
if ansible host (localhost) is the same host as kube-master[0] then
new task causes no issues and the copy to localhost process is
basically skipped.

.travis.yml

@@ -119,6 +119,7 @@ cache:
   - directories:
     - $HOME/.cache/pip
     - $HOME/.local
+    - /var/tmp/releases
 
 before_script:
   - echo "RUN $TRAVIS_JOB_NUMBER $KUBE_NETWORK_PLUGIN $CONTAINER_ENGINE "
@@ -151,6 +152,8 @@ script:
     -b --become-user=root -e cloud_provider=gce  $LOG_LEVEL -e kube_network_plugin=${KUBE_NETWORK_PLUGIN}
     -e bootstrap_os=${BOOTSTRAP_OS}
     -e ansible_python_interpreter=${PYPATH}
+    -e download_run_once=true
+    -e local_release_dir=/var/tmp/releases
     cluster.yml
 
     # Tests Cases