slapos.cli: don't log exceptions happened during loggin configuration

because it would go nowhere. just use stderr as usual

slapos/cli/entry.py

@@ -176,10 +176,10 @@ class SlapOSApp(cliff.app.App):
     def run(self, argv):
         # same as cliff.App.run except that it won't re-raise
         # a logged exception, and doesn't use --debug
-        try:
         self.options, remainder = self.parser.parse_known_args(argv)
         self.configure_logging()
         self.interactive_mode = not remainder
+        try:
             self.initialize_app(remainder)
         except Exception as err:
             LOG.exception(err)