Chore: Move to centos8-builder

Chore: Move to centos8-builder

jjb/integration/simulators/nf-simulator/integration-simulators-nf-simulator-simulator-cli.yaml
jjb/integration/simulators/nf-simulator/integration-ves-client-nf-simulator.yaml
jjb/integration/usecases/integration-usecases-A1-policy-enforcement-r-apps.yaml
jjb/integration/usecases/integration-usecases-A1-policy-enforcement.yaml
jjb/integration/xtesting/integration-xtesting.yaml
jjb/lf-infra-sandbox-3.yaml
jjb/modeling/modeling-etsicatalog.yaml
jjb/modeling/modeling-modelspec.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.yaml
jjb/multicloud/multicloud-info.yaml

Issue-ID: CIMAN-33
Signed-off-by: Bengt Thuree <bthuree@linuxfoundation.org>
Change-Id: I4431db30ba08c697751c5e37824663791c768d14
Signed-off-by: Jessica Wagantall <jwagantall@linuxfoundation.org>