Force nodepool to use ipv4 in vexxhost

Ipv6 is currently having routing issues to vexxhost IPs. Force ipv4
temporarily until this is corrected.

Change-Id: Ib935e10edd8285f7f42f7091fb47f6d872dbc57a

modules/openstack_project/templates/nodepool/clouds.yaml.erb

@@ -46,6 +46,8 @@ clouds:
     region_name: ca-ymq-1
     profile: vexxhost
     api_timeout: 60
+    # Temporarily disabled due to broken routes
+    force_ipv4: true
     auth:
       username: '<%= @vexxhost_username %>'
       password: '<%= @vexxhost_password %>'