cluster template name - ID rander issue for image and flavor

[ricolin]

Right now, we can't use image name or flavor id in cluster template or magnum-cluster-api driver will failed like this

[mnaser]

few things about this:

• CAPO accepts both imageUUID and imageName. We have historically only supported imageName. I think we can simply detect if a string is a UUID (and a valid image) and set imageUUID, otherwise set imageName.
• CAPO does not support giving a flavor ID, we currently give an error now if someoen provides a flavor ID.. but I think what we can do is simply "resolve" a flavor ID to a name in the driver.

So I think to be able to support cases where people expect to either provide name or UUID for both of those fields, we can make some small translation layer to take care of it. What do you think @okozachenko1203 ?