overcloud-deploy: add variable for hypervisor_wait

The overcloud-deploy.sh script first spins while waiting for hypervisor
resources to become available. In deployed-server environments this will
never be true, causing the job to spin indefinitely. This commit makes
this an optional component with a hypervisor_wait variable.

Change-Id: I9cc019185ccc6564aea3b5f46249c10ed8518dbb

roles/overcloud-deploy/defaults/main.yml

@@ -90,3 +90,6 @@ overcloud_templates_path: /usr/share/openstack-tripleo-heat-templates
 
 # enable IPv6 on overcloud deployment
 overcloud_ipv6: false
+
+# Wait for hypervisor in the deployment script
+hypervisor_wait: true

roles/overcloud-deploy/templates/overcloud-deploy.sh.j2

@@ -14,6 +14,7 @@ set -eux
 
 source {{ working_dir }}/stackrc
 
+{% if hypervisor_wait|bool %}
 ### --stop_docs
 # Wait until there are hypervisors available.
 while true; do
@@ -22,6 +23,7 @@ while true; do
         break
     fi
 done
+{% endif %}
 
 ### --start_docs