Correct console behavior when open session fails

When open session fails, console continued trying to use the session
even though it is a lost cause.  Correct this by bailing out in time.

Change-Id: Icc09514201c948edf21cf7e9e36f0cfe0520a2c9

pyghmi/ipmi/console.py

@@ -116,6 +116,7 @@ class Console(object):
                 return
         if 'error' in response:
             self._print_error(response['error'])
+            return
         self.activated = True
         #data[0:3] is reserved except for the test mode, which we don't use
         data = response['data']