--watch flag for 'cluster delete'

[paulbsch]

Why do you want this feature?
It would be helpful to be able see/monitor the results of 'cluster delete' on the command line.

What feature/behavior/change do you want?
Currently, 'cluster delete' immediately exits after sending the delete commands upstream. I'm proposing a --watch flag that could be set to true/false. Then eksctl could be directed to watch/monitor the cluster deletion until it finishes/fails.

Currently, the default behavior on cluster creation is essentially "--watch=true". It might also make sense to make "--watch=true" the default on delete?

[richardcase]

@paulbsch - sounds like a reasonable idea for delete. I wonder of --wait may be better?

[paulbsch]

@richardcase I'm indifferent as to what the flag is called. Whatever works.

[Lazyshot]

--wait was added in #262