Set timestamps and timeout in Jenkins plugin jobs

* .../jenkins_job_builder/config/jenkins-plugin-jobs.yaml:
The Jenkins plugin jobs override the default wrappers. Include the a
timeout and set timestamps as that config is lost when overriding the
default wrappers.

Change-Id: I8d600c1951efc34582d9644d14ce0ece1e4f1541
Reviewed-on: https://review.openstack.org/36754
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Khai Do <zaro0508@gmail.com>
Approved: Clark Boylan <clark.boylan@gmail.com>
Reviewed-by: Clark Boylan <clark.boylan@gmail.com>
Tested-by: Jenkins