Use controller-4.0.0 artifacts
Use controller-4.0.0 artifacts

Do not use snapshots, but rather released versions. This brings us
closer back to proper integration on releases.

Change-Id: I51824e3090966cc8836bc86ba09f1f1053139a97
Signed-off-by: Robert Varga <91ae5aa8c7a9f7e57b701db766e23e544aaa6ae9@pantheon.tech>

opendaylight/bgpcep