fix prun pod with container

[QiWang19]

fix #4346
This PR sets c.Force to true if user reply 'y' to system prune confirmation question.

Signed-off-by: Qi Wang qiwan@redhat.com

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[QiWang19]

@mheon @TomSweeneyRedHat PTAL.
I am confused by the man page --force Do not prompt for confirmation. This cli value has been used not only to control the prompt of the confirmation.

[mheon]

This seems VERY dangerous. We're only supposed to be removing unused containers and pods - setting force is directly counter to that.

[mheon]

I think the original suggestion - removing containers before pods - might be more suitable here. We want to prune unused containers, then prune any pod with no containers but the infra container, then prune unused images.

[mheon]

(Would need to make sure we don't accidentally prune infra containers when we prune the containers, though)

[mheon]

The use of --force to set force for pruning pods and containers also seems concerning... I don't think we should be doing that.

[rhatdan]

We don't prompt, the way that Docker does, So we should just add this as a no-op.

If you run docker image prune
It prompts you to say "Are you sure" The --force gets rid of the prompt.

So Just add the flag so that we can work with existing scripts.