Revert "Stop enabling g-reg by default"

This reverts commit d7dfcdb4674daae8a294848b1de6fa87c5d7d4eb. A
subsquent change that depends on this,
d8dec362baa2bf7f6ffe1c47352fdbe032eaf20a, has knock on effects for
devstack-gate and needs to be reverted. Revert this first.

Change-Id: Ic5402f57052648e10eacf3c3de67d2cdd2d42f63
Signed-off-by: Stephen Finucane <sfinucan@redhat.com>
Partial-bug: #1860021
2 files changed