core: log a traceback if a plugin can't be loaded

sat/core/sat_main.py

@@ -432,10 +432,8 @@ class SAT(service.Service):
         try:
             self.plugins[import_name] = getattr(mod, plugin_info["main"])(self)
         except Exception as e:
-            log.warning(
-                'Error while loading plugin "{name}", ignoring it: {error}'.format(
-                    name=plugin_info["name"], error=e
-                )
+            log.exception(
+                f"Can't load plugin \"{plugin_info['name']}\", ignoring it: {e}"
             )
             if optional:
                 return