Fail on non-retriable errors from Neutron API

Change-Id: I7dedf1587b42334163f352da3aa28300712a0d3f
Related-Issue: PROD-36617
diff --git a/_modules/neutronv2/common.py b/_modules/neutronv2/common.py
index 232112b..5612dbf 100644
--- a/_modules/neutronv2/common.py
+++ b/_modules/neutronv2/common.py
@@ -108,6 +108,7 @@
                         log.error(msg % (connect_retry_delay, i, connect_retries))
                         time.sleep(connect_retry_delay)
                         continue
+                    raise
                 break
             if not response or not response.content:
                 return {}