Update multijob to use convert_mapping_to_xml()
Update multijob to use convert_mapping_to_xml()

Change-Id: Iad3ea7fb715cb2877ea664f6502fafb488cb1346

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