Jenkins upgrade to change from fedmsg to fedora-messaging

Hello Fedora CI and Devel Teams!

The CI team will be performing a Jenkins upgrade and jms-messaging plugin
upgrade this Thursday to allow us to switch from fedmsg to
fedora-messaging. While performing this upgrade, dist-git tests will be
temporarily unavailable. When things are back to normal, we will reply-all

Much like our last maintenance window, the intent is to upgrade the
software but not actually change from fedmsg to fedora-messaging just yet.
If you have any questions or concerns, by all means please reach out.

Thank you!

-Jim Bair