Update build_keeper to use convert_mapping_to_xml()
Update build_keeper to use convert_mapping_to_xml()

Change-Id: I2cd89c84b308013b16915834af9c037d856fe026

puppetlabs/jenkins-job-builder,wsoula/jenkins-job-builder,puppetlabs/jenkins-job-builder,OSSystems/jenkins-job-builder,wikimedia/integration-jenkins-job-builder,gforcada/jenkins-job-builder,wsoula/jenkins-job-builder,wikimedia/integration-jenkins-job-builder,puppetlabs/jenkins-job-builder,OSSystems/jenkins-job-builder,OSSystems/jenkins-job-builder,puppetlabs/jenkins-job-builder,gforcada/jenkins-job-builder,wikimedia/integration-jenkins-job-builder,wsoula/jenkins-job-builder,wikimedia/integration-jenkins-job-builder,wsoula/jenkins-job-builder,gforcada/jenkins-job-builder,gforcada/jenkins-job-builder,wikimedia/integration-jenkins-job-builder,OSSystems/jenkins-job-builder,gforcada/jenkins-job-builder