Update credentials_binding to use convert_xml()
Update credentials_binding to use convert_xml()

Change-Id: If891c8ad58287f81994788b4131c300bba7a42a9

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