Log api-server exception details in neutron

Description: Neutron doesn't seem to return strings posted
by api-server to the user. So logging the exception details
in neutron logs. Previous commit was partial.

Change-Id: I912acf65155259a771ef5c14535186587a959afd
Closes-Bug: #1721609

neutron_plugin_contrail/plugins/opencontrail/contrail_plugin_base.py

@@ -84,6 +84,7 @@ def _raise_contrail_error(info, obj_name):
     exc_name = info.get('exception')
 
     if exc_name:
+        LOG.exception(str(exc_name) + str(info) + str(obj_name))
         if str(exc_name) == 'OverQuota':
             info['exception'] = str(info['exception'])
             if 'msg' in info: