Add support for fedora atomic host (#1779)

* don't try to install this rpm on fedora atomic

* add docker 1.13.1 for fedora

* built-in docker unit file is sufficient, as tested on both fedora and centos atomic

roles/docker/templates/docker_atomic.service.j2

@@ -1,37 +0,0 @@
-[Unit]
-Description=Docker Application Container Engine
-Documentation=http://docs.docker.com
-After=network.target
-Wants=docker-storage-setup.service
-
-[Service]
-Type=notify
-NotifyAccess=all
-EnvironmentFile=-/etc/sysconfig/docker
-EnvironmentFile=-/etc/sysconfig/docker-storage
-Environment=GOTRACEBACK=crash
-Environment=DOCKER_HTTP_HOST_COMPAT=1
-Environment=PATH=/usr/libexec/docker:/usr/bin:/usr/sbin
-ExecReload=/bin/kill -s HUP $MAINPID
-Delegate=yes
-KillMode=process
-ExecStart=/usr/bin/dockerd-current \
-          --add-runtime docker-runc=/usr/libexec/docker/docker-runc-current \
-          --default-runtime=docker-runc \
-          --exec-opt native.cgroupdriver=systemd \
-          --userland-proxy-path=/usr/libexec/docker/docker-proxy-current \
-          $DOCKER_OPTS \
-          $DOCKER_STORAGE_OPTIONS \
-          $DOCKER_NETWORK_OPTIONS \
-          $DOCKER_DNS_OPTIONS \
-          $ADD_REGISTRY \
-          $BLOCK_REGISTRY \
-          $INSECURE_REGISTRY
-LimitNOFILE=1048576
-LimitNPROC=1048576
-LimitCORE=infinity
-TimeoutStartSec=1min
-Restart=on-abnormal
-
-[Install]
-WantedBy=multi-user.target