Set default timeout to 60 seconds for docker stop

The previous default timeout was 10 seconds, which does not always
allow services enough time to shut down safely.

Change-Id: I54eff91567108a7e5d99f067829ae4a6900cd859

ansible/group_vars/all.yml

@@ -110,6 +110,9 @@ docker_restart_policy_retry: "10"
 docker_configure_for_zun: "no"
 docker_zun_options: -H fd:// -H tcp://{{ api_interface_address }}:2375 --cluster-store=etcd://{% for host in groups['etcd'] %}{{ hostvars[host]['ansible_' + hostvars[host]['api_interface']]['ipv4']['address'] }}:{{ hostvars[host]['etcd_client_port'] }}{% if not loop.last %},{% endif %}{% endfor %}
 
+# Timeout after Docker sends SIGTERM before sending SIGKILL.
+docker_graceful_timeout: 60
+
 # Common options used throughout Docker
 docker_common_options:
   auth_email: "{{ docker_registry_email }}"
@@ -120,6 +123,7 @@ docker_common_options:
     KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
   restart_policy: "{{ docker_restart_policy }}"
   restart_retries: "{{ docker_restart_policy_retry }}"
+  graceful_timeout: "{{ docker_graceful_timeout }}"
 
 ####################
 # Dimensions options

releasenotes/notes/docker-stop-timeout-c8089f6bf92d6c28.yaml

@@ -0,0 +1,6 @@
+---
+upgrade:
+  - |
+    Increases the default value of ``docker_graceful_timeout`` from 10 to 60.
+    This sets the time that docker will wait for a container to gracefully stop
+    before issuing a KILL signal.