Update ubuntu build node

Update to a newer image since the one beeing used
previously was to old (2017), and we had issues with
it in the Sandbox

Signed-off-by: Bengt Thuree <bthuree@linuxfoundation.org>
Change-Id: I176e9171443579df5ba5ccd18480048670d539c3
Issue-ID: CIMAN-1
1 file changed