fix removal of packer bundled ansible plugin- see https://www.hashicorp.com/blog/announcing-the-removal-of-bundled-plugins-in-hashicorp-packer

Author: sjpb

packer/openstack.pkr.hcl

@@ -11,6 +11,10 @@ packer {
       version = ">= 1.0.0"
       source  = "github.com/hashicorp/openstack"
     }
+    ansible = {
+      version = ">= 1.1.1"
+      source  = "github.com/hashicorp/ansible"
+    }
   }
 }