"This milestone focuses on two themes: database and security." https://bz-web2-test.devel.redhat.com/ is using a self-signed cert. You should get our IT organization to give you a cert signed by their CA.
bz-web2-test.devel.redhat.com is strictly a internal development server so will not need a signed cert. When we push external betas to partner-bugzilla.redhat.com , they will definitely be using official certs.