[b/r] add attr package to swift to have getfattr

[stuggi]

Jira: OSPRH-31535

[fmount]

Thanks @stuggi, the change lgtm as we need that package in the swift containers. I assume we have to cherry-pick to https://github.com/openstack-k8s-operators/tcib/tree/antelope to make it 18

[fmount]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: fmount, stuggi

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[stuggi]

/cherry-pick antelope

[openshift-cherrypick-robot]

@stuggi: once the present PR merges, I will cherry-pick it on top of antelope in a new PR and assign it to you.

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In response to this:

/cherry-pick antelope

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[openshift-cherrypick-robot]

@stuggi: new pull request created: #402

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In response to this:

/cherry-pick antelope

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