review02.opendev.org is a much larger replacement server for review01
provided by Vexxhost. It is up and running, with gerrit2 volume
attached and DNS entries.
This adds it to the staging group with no replication and a local h2
database configured for initial bringup. There's quite a bit to
consider for full migration, but this will let us start experimenting.
Change-Id: I3638a5c0c7028dcc800ada42431b75395cff0c42
525d5d1c19