Dash changed to underscore in flask commands

Linked to click update to 7.x

Subcommands that are named by the function now automatically have the
underscore replaced with a dash. If you register a function named
my_command it becomes my-command in the command line interface.

JIRA INFRA-687

Makefile

@@ -42,7 +42,7 @@ db: ## start postgres and redis for development
 
 init_db: ## initialize the dev database
 	docker-compose run --rm web flask db upgrade head
-	docker-compose run --rm web flask create_defaults
+	docker-compose run --rm web flask create-defaults
 
 upgrade_db: ## upgrade the dev database
 	docker-compose run --rm web flask db upgrade head