Use a new per-service format

Note: whilst this is a large patch, most of it is just moving stuff around.

This has a number of benefits now:
- generate the marathon/chronos files
- one file per running container (easier to manage changes)
- no need to redefine lots of marathon attributes
- to create special marathon attributes specify them under
  "service"/"task" or "container" depending on the attribute
  and it will override the value in services/default.marathon.j2
- render the command's files just before running the command
  (previously there was a risk of rendering the files too early)

We can benefit from the changes with a little more work:
- any update tasks can be easily separated from the service

Change-Id: I007c2859b9d4bf8e9b984cbeba93456a9ce06f29

services/cinder/cinder-scheduler.yml.j2

@@ -0,0 +1,21 @@
+name: openstack/cinder/cinder-scheduler
+container:
+  image: "{{ cinder_scheduler_image }}:{{ cinder_scheduler_tag }}"
+service:
+  daemon:
+    dependencies: [cinder_ansible_tasks/create_user,
+                   keystone_ansible_tasks/running,
+                   rabbitmq/daemon]
+    command: /usr/bin/cinder-scheduler
+    files:
+      cinder.conf.j2:
+        source: ["config/cinder/templates/cinder.conf.j2",
+                 "config/cinder/templates/cinder-{{ cinder_volume_driver }}.conf.j2",
+                 "/etc/kolla-mesos/config/global.conf",
+                 "/etc/kolla-mesos/config/database.conf",
+                 "/etc/kolla-mesos/config/messaging.conf",
+                 "/etc/kolla-mesos/config/cinder.conf",
+                 "/etc/kolla-mesos/config/cinder/cinder-scheduler.conf"]
+        dest: /etc/cinder/cinder.conf
+        owner: cinder
+        perm: "0600"