Added main entry point
Added main entry point

This allows using external debuggers.

Change-Id: I8d29534b0ef22c3ddb0e70c7fafe94f49c0d7f4e
Signed-off-by: Sorin Sbarnea <8938dff14221394d430a023580a32caf3bfb26a9@redhat.com>

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