Sorry for the delay in getting to this. There are two things needed here. Firstly we have to tell Beaker that RedHatGlusterStorage3 is actually "RHEL6-alike" for the purposes of kickstart generation. And we need to create a harness repo for RedHatGlusterStorage3 (using the RHEL6 harness packages). We can fix it in the next release of Beaker, and I will use this bz to track the Beaker-side fix. In the near term we can also fix it manually in beaker.engineering.redhat.com to get the RHGS jobs going there. I have updated the RT ticket with some instructions.
Patch to make Beaker treat RedHatGlusterStorage3 like RHEL6 by default: http://gerrit.beaker-project.org/4278 Harness repo symlinks for RedHatGlusterStorage3: https://git.beaker-project.org/cgit/beaker-project.org/commit/?id=6f473351ad87ba48c05177cd7a7f37d24c6f6b24
Beaker 20.2 has been released.