Cleanup container script improvement

Currently, when there are some qemu processes which may be some useful
virtual machines running by the operator running on non compute node, the
cleanup script will fail the cleanup operation for that node. We need to
ignore the qemu process check for non compute nodes.

Change-Id: If49a1a30764063935b2a65312de8f3b2357c7fbc
Closes-bug: 1633005

ansible/roles/destroy/tasks/cleanup_containers.yml

@@ -1,3 +1,10 @@
 ---
-- name: Destroying all Kolla containers and volumes
+- name: Destroying all Kolla containers and volumes on compute node
+  environment:
+    COMPUTE: true
   command: /tmp/kolla-cleanup/tools/cleanup-containers
+  when: inventory_hostname in groups['compute']
+
+- name: Destroying all Kolla containers and volumes on non compute node
+  command: /tmp/kolla-cleanup/tools/cleanup-containers
+  when: inventory_hostname not in groups['compute']

tools/cleanup-containers

@@ -1,5 +1,5 @@
 #!/bin/bash
-if [[ $(pgrep qemu) ]]; then
+if [[ $COMPUTE ]] && [[ $(pgrep qemu) ]]; then
     echo "Some qemu processes were detected."
     echo "Docker will not be able to stop the nova_libvirt container with those running."
     echo "Please clean them up before rerunning this script."