Comment 4 for bug 1842358

Here's another idea for this: diffing bundles with overlays against other bundles with overlays.

This is something that I see when we're dealing with reviewing bundles from Field for BootStack clouds. I may have cloud #1, which BootStack has accepted management of, which was deployed via a bundle plus e.g. 3 overlays. Then I may have proposed cloud #2, which BootStack is reviewing bundles for, which is comprised of a bundle plus overlays as well - maybe 4 overlays in this case because things were refactored or something similar. It'd be good to compare the combination of the bundle and overlays from cloud #1 versus the same combination for cloud #2 to identify intended and unintended deltas.

Presently the closest we can get with Juju's tooling is to compare the pre-handover cloud #1 bundles versus the live cloud #1, and then the live cloud #1 against the proposed cloud #2 bundles.