[CI] Upgrading Jenkins

[Prasanna Santhanam]

Hi,

I'm hitting couple of jenkins bugs [1][2] on my build jobs.
Jenkins.cs.o will be upgraded.

[1] https://issues.jenkins-ci.org/browse/JENKINS-13972
[2] https://issues.jenkins-ci.org/browse/JENKINS-17337

Thanks,

-- 
Prasanna.,