Updated pssh.utils.enable_logger to be more compatible with py 2.6. Cleanup

Author: Dan

examples/pssh_local.py

@@ -26,7 +26,7 @@
 
 utils.enable_host_logger()
 utils.enable_logger(utils.logger)
-    
+
 def test():
     """Perform ls and copy file with SSHClient on localhost"""
     client = SSHClient('localhost')

pssh/utils.py

@@ -26,7 +26,9 @@
 
 def enable_logger(_logger, level=logging.INFO):
     """Enables logging to stdout for given logger"""
-    if logging.StreamHandler in [type(h) for h in _logger.handlers]:
+    stream_handlers = [h for h in _logger.handlers
+                       if isinstance(h, logging.StreamHandler)]
+    if stream_handlers:
         logger.warning("Logger already has a StreamHandler attached")
         return
     handler = logging.StreamHandler()