demo: Add a disk to the etcd image

etcd works better with a persistent storage. So configure a
disk and add the formatting container to the image.

Signed-off-by: Rolf Neugebauer <rolf.neugebauer@docker.com>

projects/demo/etcd/etcd.yml

@@ -14,6 +14,13 @@ onboot:
     capabilities:
      - CAP_SYS_ADMIN
     readonly: true
+  - name: format
+    image: "mobylinux/format:53748000acf515549d398e6ae68545c26c0f3a2e"
+    binds:
+     - /dev:/dev
+    capabilities:
+     - CAP_SYS_ADMIN
+     - CAP_MKNOD
 services:
   - name: rngd
     image: "mobylinux/rngd:3dad6dd43270fa632ac031e99d1947f20b22eec9@sha256:1c93c1db7196f6f71f8e300bc1d15f0376dd18e8891c8789d77c8ff19f3a9a92"
@@ -35,12 +42,15 @@ services:
   - name: etcd
     image: "mobylinux/etcd"
     capabilities:
-     - CAP_NET_BIND_SERVICE
      - CAP_CHOWN
      - CAP_SETUID
      - CAP_SETGID
      - CAP_DAC_OVERRIDE
+     - CAP_SYS_ADMIN
+     - CAP_MKNOD
     net: host
+    binds:
+     - /dev:/dev
 outputs:
   - format: kernel+initrd
 #  - format: gcp

projects/demo/etcd/infrakit.json

@@ -14,7 +14,7 @@
             "Plugin": "instance-hyperkit",
             "Properties": {
                 "Moby": "etcd",
-                "Disk" : 0,
+                "Disk" : 1024,
                 "CPUs" : 1,
                 "Memory" : 1024
             }