support older bootstrap script after chaning default repo
support older bootstrap script after chaning default repo

the default repo in the bootstrap script on scala/scala changed from
scala-release-temp to scala-intgration. this change supports running
the previous script.

scala/scala-jenkins-infra,lrytz/scala-jenkins-infra,scala/scala-jenkins-infra,lrytz/scala-jenkins-infra,lrytz/scala-jenkins-infra