Merge pull request #808 from vkarak/bugfix/syslog-handler-crash

[bugfix] Fix crash when using syslog logging handler with the `-v` option

Author: Vasileios Karakasis

reframe/core/logging.py

@@ -400,7 +400,7 @@ def setLevel(self, level):
     def std_stream_handlers(self):
         if self.logger:
             return [h for h in self.logger.handlers
-                    if h.stream == sys.stdout or h.stream == sys.stderr]
+                    if isinstance(h, logging.StreamHandler)]
         else:
             return []