[feature] make wait optional on create/delete

Stack create and delete take an option to wait for the operation to
complete. It doesn't actually wait for the operation to complete, just
for the Openstack side of it to be done. For creation for exemple, the
nodes might still be booting.

chi-appliance.py

@@ -51,7 +51,7 @@ def do_create(argv):
     template = os.path.abspath(argv.template)
     try:
         ret = shade_client.create_stack(argv.name, template_file=template,
-                                        wait=True, **extra_args)
+                                        wait=argv.wait, **extra_args)
         print(json.dumps(ret, indent=4))
     except shade.exc.OpenStackCloudHTTPError as e:
         print(e)
@@ -60,7 +60,7 @@ def do_create(argv):
 def do_delete(argv):
     """Delete an appliance with <name>."""
     shade_client = get_shade_client(argv.region)
-    ret = shade_client.delete_stack(argv.name)
+    ret = shade_client.delete_stack(argv.name, wait=argv.wait)
     if ret:
         print("Appliance successfully deleted.")
     else:
@@ -216,6 +216,8 @@ def main():
 
     # create a lease
     parser_create = subparsers.add_parser("create", help="Create an appliance")
+    parser_create.add_argument("--wait", action='store_true',
+                               help="Wait for the operation to complete")
     parser_create.add_argument("name", help="Name of the appliance")
     parser_create.add_argument("lease", help="Lease for the appliance")
     parser_create.add_argument("template", help="Appliance template")
@@ -225,6 +227,8 @@ def main():
     parser_create.set_defaults(func=do_create)
 
     parser_delete = subparsers.add_parser("delete", help="Delete an appliance")
+    parser_delete.add_argument("--wait", action='store_true',
+                               help="Wait for the operation to complete")
     parser_delete.add_argument("name", help="Name of the appliance")
     parser_delete.set_defaults(func=do_delete)