Enable tenant namespacing in radosgw

[Ponnuvel Palaniyappan]

Can we enable tenant-namespacing by default?

A customer has requested enabling `namespace-tenants` for an existing deployment to enable namespacing to match keystone tenant names. Which is not supported as documented [0].
But I do wonder why we can't have this enabled for new deployments. Are they new downsides/gotchas why this couldn't be done for new deployments?

[0] https://charmhub.io/ceph-radosgw/configure#namespace-tenants

[Ponnuvel Palaniyappan (pponnuvel)]

This was accidentally enabled for some time in the past:

https://bugs.launchpad.net/charm-ceph-radosgw/+bug/1847769

And then it was "fixed".

Just noting if that could give additional context to others.

[Chris MacNaughton (chris.macnaughton)]

The unintentional part there was that we didn't want it to ship on-by-default for a newly released charm feature; I'm more and more in favour of enabling it by default at this point but nobody's asked for it!

[Ponnuvel Palaniyappan (pponnuvel)]

Raised with FCE too to change the deployment template:

https://bugs.launchpad.net/cpe-foundation/+bug/2004255

(access may be restricted as FCE project is private)