Loss of Jenkins build data

[Ben Cooksley]

Hi all,

Due to https://issues.jenkins-ci.org/browse/JENKINS-21268 we have lost
the past 2 weeks worth of Jenkins builds on the CI system. Hopefully
all other changes in the past 2 weeks have remained persistent as it
is unclear whether they will survive this bug as well.

As the Maven plugin has now been re-enabled, this issue should now
hopefully be resolved for all future build records.

Thanks,
Ben