Set watch_tools to auto.

Author: jmchilton

planemo/galaxy_config.py

@@ -172,6 +172,7 @@ def config_join(*args):
             id_secret="${id_secret}",
             log_level="${log_level}",
             debug="${debug}",
+            watch_tools="auto",
             tool_data_table_config_path=tool_data_table,
             integrated_tool_panel_config=("${temp_directory}/"
                                           "integrated_tool_panel_conf.xml"),