Implement configurable start delay for containers

With the move of the container creation process from each service
playbook into the lxc-container-create playbook/role, it would be
appropriate to ensure that the delay implemented in the service
plays is implemented in the role.

This patch does so.

Change-Id: I473bcccde315ef66f45e912ad33ed665bed3b07c

defaults/main.yml

@@ -16,6 +16,9 @@
 ## Verbosity Options
 debug: False
 
+## SSH connection wait time
+lxc_container_ssh_delay: 5
+
 lxc_container_config: /etc/lxc/lxc-openstack.conf
 lxc_container_default_config_list:
   - "lxc.start.auto=1"

releasenotes/notes/lxc-container-start-delay-d7917f69d9469316.yaml

@@ -0,0 +1,6 @@
+---
+features:
+  - The LXC container creation process now has a configurable
+    delay for the task which waits for the container to start.
+    The variable ``lxc_container_ssh_delay`` can be set to
+    change the default delay of five seconds.

tasks/container_create.yml

@@ -251,7 +251,7 @@
     port: "{{ ansible_ssh_port | default('22') }}"
     host: "{{ ansible_ssh_host | default(inventory_hostname) }}"
     search_regex: OpenSSH
-    delay: 1
+    delay: "{{ lxc_container_ssh_delay }}"
   tags:
     - lxc-container-networks