Update _groovy_common_scriptSource to use convert_xml()
Update _groovy_common_scriptSource to use convert_xml()

Change-Id: I727542f9de98ecfb42ef3580e789163f6277ef52

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