print status details while waiting

[msherman64]

Update the container.wait() callback to print container status, status detail, and status reason while waiting.

Examples:

To make this work, we need access to updated zun container parameters in the wait loop. To that end, I've copied the "status" updating property approach, but just store the whole zun container dict. This allows us to fetch once per loop, and then reference parameters without re-fetching for each one.

[Mark-Powers]

Looks good. Not sure if we want to print out every iteration, as it takes a few minutes sometimes? Maybe by default it could update only on status change?

[msherman64]

Looks good. Not sure if we want to print out every iteration, as it takes a few minutes sometimes? Maybe by default it could update only on status change?

I've now ensured it only prints on status changes, and increments a counter when statuses are seen repeatedly.