bump python-jenkins version
bump python-jenkins version

Bumps python-jenkins version to avoid few
remarkable issues fixed in it:
- allow to wait for jenkins to enter normal operation
- remove cap on pbr version
- more py3 enablement
- other, see its changelog

Change-Id: I508b412bc2d17561e7a7ceef015ea018615596ad

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