Chore: Move to ubuntu2004-builder

Chore: Move to ubuntu2004-builder

jjb/policy/policy-xacml-pdp.yaml
jjb/sdc/sdc-onap-ui-angular.yaml
jjb/sdc/sdc-onap-ui-common.yaml
jjb/sdc/sdc-sdc-be-common.yaml
jjb/sdc/sdc-sdc-distribution-client.yaml
jjb/sdc/sdc-sdc-docker-base.yaml
jjb/sdc/sdc-sdc-pubsub.yaml
jjb/sdc/sdc-sdc-tosca.yaml
jjb/sdc/sdc-sdc-workflow-designer.yaml
jjb/sdnc/sdnc-apps.yaml
jjb/sdnc/sdnc-northbound.yaml
jjb/sdnc/sdnc-oam.yaml
jjb/so/so-libs.yaml
jjb/testsuite/testsuite-python-testing-utils.yaml
jjb/usecaseui/usecase-ui-intent-analysis.yaml

Issue-ID: CIMAN-33
Signed-off-by: Bengt Thuree <bthuree@linuxfoundation.org>
Change-Id: Ie6606c520266ef6299b8ee599858f47ce0c75734