examples: Don't use a file section if you don't need it

Exception is ./moby.yaml where it serves as an example.

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

examples/docker.yml

@@ -76,6 +76,9 @@ services:
     binds:
      - /var/lib/docker:/var/lib/docker
      - /lib/modules:/lib/modules
+files:
+  - path: etc/docker/daemon.json
+    contents: '{"debug": true}'
 trust:
   image:
     - mobylinux/kernel

examples/gcp.yml

@@ -64,9 +64,6 @@ services:
 trust:
   image:
     - mobylinux/kernel
-files:
-  - path: etc/docker/daemon.json
-    contents: '{"debug": true}'
 outputs:
   - format: kernel+initrd
   - format: gcp

examples/vmware.yml

@@ -45,8 +45,5 @@ services:
 trust:
   image:
     - mobylinux/kernel
-files:
-  - path: etc/docker/daemon.json
-    contents: '{"debug": true}'
 outputs:
   - format: vmdk