Tidy up config object
Tidy up config object

Remove unnecessary class members that are not used or queried after
object initialization.

Remove temporary assignment no longer needed.

Change-Id: Iab2cd2a69fae103967bb20cf2ede4884f4bf67d6

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