Chore: Move to ubuntu2004-builder

Chore: Move to ubuntu2004-builder

jjb/modeling/modeling-etsicatalog.yaml
jjb/msb/msb-apigateway.yaml
jjb/msb/msb-discovery.yaml
jjb/msb/msb-java-sdk.yaml
jjb/msb/msb-swagger-sdk.yaml
jjb/multicloud/multicloud-framework-java.yaml
jjb/multicloud/multicloud-framework-python.yaml
jjb/multicloud/multicloud-k8s.yaml
jjb/multicloud/multicloud-openstack-vmware-java.yaml
jjb/multicloud/multicloud-openstack-vmware-python.yaml
jjb/multicloud/multicloud-openstack.yaml
jjb/music/music-distributed-kv-store.yaml
jjb/music/music-jar.yaml
jjb/oom/oom-registrator.yaml
jjb/oom/oom-templates.yaml

Issue-ID: CIMAN-33
Signed-off-by: Bengt Thuree <bthuree@linuxfoundation.org>
Change-Id: If2742342f878a48b2f2f64eeb58b6ba3484c3a76