[FIX] server.py: stop the FSWatcher when stopping the server

Avoid potential tracebacks from the FSWatcher's thread being killed.

Drawback: Server shut down can have an extra small delay

(only applies when the --dev=reload option is given)

odoo/service/server.py

@@ -1019,10 +1019,10 @@ def start(preload=None, stop=False):
 
     rc = server.run(preload, stop)
 
+    if watcher:
+        watcher.stop()
     # like the legend of the phoenix, all ends with beginnings
     if getattr(odoo, 'phoenix', False):
-        if watcher:
-            watcher.stop()
         _reexec()
 
     return rc if rc else 0