Modify KuryrException extend Exception appropriately
Modify KuryrException extend Exception appropriately

This patch modifies KuryrException call the initializer of the super
class. This fixes Kuryr not to return the empty error response.

Change-Id: I728a24df6f20a81090c98aac46be22f3d27cd884
Signed-off-by: Taku Fukushima <d385cb54d860d8a5dcc6157b54cf213091772451@gmail.com>
Closes-Bug: #1503518

celebdor/kuryr-libnetwork,openstack/kuryr,midonet/kuryr,celebdor/kuryr,midonet/kuryr,celebdor/kuryr-libnetwork,celebdor/kuryr,celebdor/kuryr-libnetwork,midonet/kuryr,openstack/kuryr