* [ci] Set default ACR in UpgrateVersion/PR/official pipeline. (#10341)
Why I did it
docker hub will limit the pull rate.
Use ACR instead to pull debian related docker image.
How I did it
Set DEFAULT_CONTAINER_REGISTRY in pipeline.
* Add a config variable to override default container registry instead of dockerhub. (#10166)
* Add variable to reset default docker registry
* fix bug in docker version control
Why I did it
Fix the boolean value case sensitive issue in Azure Pipelines
When passing parameters to a template, the "true" or "false" will have case sensitive issue, it should be a type casting issue.
To fix it, we change the true/false to yes/no, to escape the trap.
Support to override the job groups in the template, so PR build has chance to use different build parameters, only build simple targets. For example, for broadcom, we only build target/sonic-broadcom.bin, the other images, such as swi, debug bin, etc, will not be built.
