[cern] Upgrade to Fedora Atomic 25

Cherry-pick: https://review.openstack.org/#/c/417457/8

Image contains: kubernetes-1.4.7-1.fc25.x86_64 docker-1.12.5-4.git03508cc.fc25.x86_64 flannel-0.5.5-8.fc25.x86_64 etcd-3.0.15-1.fc25.x86_64

• For this upgrade the upstream image is used, which is uploaded here [1].
• Minor changes for flannel and docker-storage-setup were needed.
• The image will be built in the CI and uploaded to tarballs.openstack.org as soon as possible.

[1] https://fedorapeople.org/groups/magnum/fedora-atomic-25-20161221.qcow2

Change-Id: Iac6e30c530821a49a5c3978e335e0b1d56a576e0

Conflicts: magnum/drivers/common/templates/fragments/configure_docker_storage_driver_atomic.sh magnum/drivers/common/templates/kubernetes/fragments/write-network-config.sh magnum/drivers/k8s_fedora_atomic_v1/version.py magnum/drivers/swarm_fedora_atomic_v1/version.py magnum/tests/contrib/gate_hook.sh

magnum/drivers/common/templates/fragments/configure-docker-storage.sh

 #!/bin/sh
 
+set -x
+
 . /etc/sysconfig/heat-params
 
 if [ -n "$DOCKER_VOLUME_SIZE" ] && [ "$DOCKER_VOLUME_SIZE" -gt 0 ]; then
@@ -30,6 +32,8 @@ if [ -n "$DOCKER_VOLUME_SIZE" ] && [ "$DOCKER_VOLUME_SIZE" -gt 0 ]; then
   fi
 fi
 
+systemctl stop docker
+
 $configure_docker_storage_driver
 
 if [ "$DOCKER_STORAGE_DRIVER" = "overlay" ]; then
@@ -44,3 +48,5 @@ if [ "$DOCKER_STORAGE_DRIVER" = "overlay" ]; then
 else
     configure_devicemapper
 fi
+
+systemctl start docker-storage-setup