Merge pull request #825 from Automattic/cache-purge-message

Additional messaging around cache purges

wp-cli/vip-cache.php

@@ -8,6 +8,9 @@ function purge( $args, $assoc_args ) {
 		// This sets up the URL/regex to be banned.  There's no need to manually
 		// execute a purge since it is handled automatically on the `shutdown` hook.
 		WPCOM_VIP_Cache_Manager::instance()->purge_site_cache();
+		if ( defined( 'WPCOM_SANDBOXED' ) && WPCOM_SANDBOXED ) {
+			WP_CLI::line( 'Because you are sandboxed this has only purged the Varnish cache on your sandbox host, un-sandbox and use the button in the site admin area if you need to purge the VIP Go edge cache.' );
+		}
 		WP_CLI::success( 'Varnish cache purged!' );
 	}
 }