Fix webclient viability after error

When error encountered, we still need to consume
the response with rsp.read(), or else a subsequent
request will fail.

Change-Id: Ica4f69cadf32a204af3e69a1ee6d336e08f7fc78

pyghmi/util/webclient.py

@@ -63,6 +63,8 @@ class SecureHTTPConnection(httplib.HTTPConnection, object):
         rsp = self.getresponse()
         if rsp.status == 200:
             return json.loads(rsp.read())
+        rsp.read()
+        return {}
 
     def request(self, method, url, body=None, headers=None):
         if headers is None: