cli: exit from main loop after 'quit' editor command

When we stop processing the editor command loop (after a 'quit'
command) we must quit the GLib main loop.

https://bugzilla.redhat.com/show_bug.cgi?id=1517401
(cherry picked from commit 21cfeff777)
(cherry picked from commit 66a728e8ac)

clients/cli/connections.c

@@ -7779,6 +7779,8 @@ editor_menu_main (NmCli *nmc, NMConnection *connection)
 		g_object_unref (rem_con);
 	g_weak_ref_clear (&weak);
 
+	quit ();
+
 	/* Save history file */
 	save_history_cmds (nm_connection_get_uuid (connection));