Add --scalyr-key option to the update subcommand

By popular request.

planb/cli.py

@@ -90,6 +90,7 @@ def create(regions: list,
 @click.option('--docker-image', type=str)
 @click.option('--taupage-ami-id', type=str)
 @click.option('--instance-type', type=str)
+@click.option('--scalyr-key')
 @click.option('--sns-topic', help=sns_topic_help)
 @click.option('--sns-email', help=sns_email_help)
 def update(cluster_name: str,
@@ -99,6 +100,7 @@ def update(cluster_name: str,
            docker_image: str,
            taupage_ami_id: str,
            instance_type: str,
+           scalyr_key: str,
            sns_topic: str,
            sns_email: str):
 

planb/update_cluster.py

@@ -294,9 +294,15 @@ def build_run_instances_params(
             }
         }
     }
+
     docker_image = options.get('docker_image')
     if docker_image:
         user_data_changes['source'] = docker_image
+
+    scalyr_key = options.get('scalyr_key')
+    if scalyr_key:
+        user_data_changes['scalyr_account_key'] = scalyr_key
+
     params['UserData'].update(user_data_changes)
     return params