Manage show_jid in master configuration

This makes it easier for users to check the status of jobs that ran into
a timeout.

salt/files/master.d/f_defaults.conf

 # Return minions that timeout when running commands like test.ping
 {{ get_config('show_timeout', 'True') }}
 
+# Display the jid when a job is published
+{{ get_config('show_jid', 'False') }}
+
 # By default, output is colored. To disable colored output, set the color value
 # to False.
 {{ get_config('color', 'True') }}