Use docker-compose ps -qa for graceful restart

Our graceful restart scripts were written for docker-compose which,
unlike "docker", returns information about stopped containers in
the output of the "ps" subcommand.

Now that we are switching to the docker compose plugin, the ps
subcommand apparently behaves more like the docker ps command.
Update our scripts to include the "-a" argument which includes
all containers.  This works with both versions of compose.

Change-Id: I950e07ba0cb514c32410a239d92075a11a27a839

playbooks/roles/zuul-executor/tasks/graceful.yaml

@@ -1,8 +1,8 @@
 - name: Check if Zuul Executor containers are running
   # It is possible they are stopped due to some external circumstance.
-  # NOTE: docker-compose ps -q reports exited containers unlike docker ps -q
+  # NOTE: docker-compose ps -qa reports exited containers
   command:
-    cmd: docker-compose ps -q
+    cmd: docker-compose ps -qa
     chdir: /etc/zuul-executor
   become: true
   become_user: root
@@ -22,7 +22,7 @@
     - "'No container found' not in ze_graceful.stderr"
 - name: Wait for Zuul Executor to stop
   shell:
-    cmd: docker-compose ps -q | xargs docker wait
+    cmd: docker-compose ps -qa | xargs docker wait
     chdir: /etc/zuul-executor
   become: true
   become_user: root

playbooks/roles/zuul-launcher/tasks/graceful.yaml

@@ -1,8 +1,8 @@
 - name: Check if Zuul launcher containers are running
   # It is possible they are stopped due to some external circumstance.
-  # NOTE: docker-compose ps -q reports exited containers unlike docker ps -q
+  # NOTE: docker-compose ps -qa reports exited containers
   command:
-    cmd: docker-compose ps -q
+    cmd: docker-compose ps -qa
     chdir: /etc/zuul-launcher
   become: true
   become_user: root
@@ -29,7 +29,7 @@
     - "'No container found' not in zl_graceful.stderr"
 - name: Wait for Zuul Launcher to stop
   shell:
-    cmd: docker-compose ps -q | xargs docker wait
+    cmd: docker-compose ps -qa | xargs docker wait
     chdir: /etc/zuul-launcher
   become: true
   become_user: root

playbooks/roles/zuul-merger/tasks/graceful.yaml

@@ -1,8 +1,8 @@
 - name: Check if Zuul merger containers are running
   # It is possible they are stopped due to some external circumstance.
-  # NOTE: docker-compose ps -q reports exited containers unlike docker ps -q
+  # NOTE: docker-compose ps -qa reports exited containers
   command:
-    cmd: docker-compose ps -q
+    cmd: docker-compose ps -qa
     chdir: /etc/zuul-merger
   become: true
   become_user: root
@@ -29,7 +29,7 @@
     - "'No container found' not in zm_graceful.stderr"
 - name: Wait for Zuul Merger to stop
   shell:
-    cmd: docker-compose ps -q | xargs docker wait
+    cmd: docker-compose ps -qa | xargs docker wait
     chdir: /etc/zuul-merger
   become: true
   become_user: root