Ensure SizeRw is shown when a user does 'inspect --size -t container'.

[NevilleC]

Currently, if a user requests the size on a container (inspect --size -t container),
the SizeRw does not show up if the value is 0. It's because InspectContainerData is
defined as int64 and there is an omit when empty.

We do want to display it even if the value is empty. I have changed the type of SizeRw to be a pointer to an int64 instead of an int64. It will allow us to distinguish the empty value to the missing value.

I updated the test "podman inspect container with size" to ensure we check thatSizeRw is displayed correctly.

Diff between master and feature branch:

+       "SizeRw": 0,
        "SizeRootFs": 742472,
            "ShmSize": 67108864,
            "ConsoleSize": [

If we don't request the size, we can see that SizeRw and SizeRootFs are not shown so it does not seem to generate regression:

./podman inspect -t container 549e4a3cde64-infra | grep ize -i
            "ShmSize": 67108864,
            "ConsoleSize": [

Closes #4744

Signed-off-by: NevilleC neville.cain@qonto.eu

[openshift-ci-robot]

Hi @NevilleC. Thanks for your PR.

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[mheon]

/ok-to-test
/approve

Code LGTM. I like it when things are simple to fix.

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: mheon, NevilleC

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[rhatdan]

Thanks @NevilleC
/lgtm