py34: fix invalid syntax for exception re-raise
py34: fix invalid syntax for exception re-raise

Change-Id: I6260cb666d376379fe1e7559b386ab3a76471008

hayderimran7/ec2-api,openstack/ec2-api,openstack/ec2-api,stackforge/ec2-api,hayderimran7/ec2-api,stackforge/ec2-api