add swap column to crictl stats

[kannon92]

What type of PR is this?

/kind feature

What this PR does / why we need it:

Add Swap to crictl stats display.

Which issue(s) this PR fixes:

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Add swap to crictl stats default output.

[kannon92]

/hold

Going to test.

[SergeyKanzhelev]

/lgtm

It will be 0 most times unless somebody enabled it. So it is good to have it as a last column.

[kannon92]

I got hit with a vagrant bug in the latest that is making it difficult to confirm this works.

I was able to see the column.

[SergeyKanzhelev]

I was able to see the column.

great. I was wondering how it will behave when there is no swap. It should panic or anything

[kannon92]

great. I was wondering how it will behave when there is no swap. It should panic or anything

We always show swap in the stats (crictl stats -output=json) will show that it is 0.

From what I saw it was reporting zero.

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: kannon92, saschagrunert

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