Update least_load to make use of convert_mapping_to_xml()
Update least_load to make use of convert_mapping_to_xml()

Change-Id: I79daaa3edb8c4480672f432f1c9240c4d4f857bc

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