Update copyartifact_build_selector_param to use convert_to_xml()
Update copyartifact_build_selector_param to use convert_to_xml()

Change-Id: I8423b67349cbff5de3fa68f3282bdb7a025baf3d

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