hotfix: avoid sigpipe in periodic-etcd-defragger

[danilo-gemoli]

Follow up of #50172.
After I've enabled tracing in bash with set -x, the logs show:

+ FRAGMENTATION_RATIO_THRESHOLD=45
+ DB_SIZE_THRESHOLD=104857600
++ oc -n openshift-etcd get pods -letcd -oname
++ head -1
+ etcd_pod=pod/etcd-build0-gstfj-m-0.c.openshift-ci-build-farm.internal
{"component":"entrypoint","error":"wrapped process failed: exit status 141","file":"k8s.io/test-infra/prow/entrypoint/run.go:84","func":"k8s.io/test-infra/prow/entrypoint.Options.internalRun","level":"error","msg":"Error executing test process","severity":"error","time":"2024-03-25T08:56:20Z"}

It should be the same error as here and here.

Thanks @stevekuznetsov

[openshift-ci-robot]

[REHEARSALNOTIFIER]
@danilo-gemoli: no rehearsable tests are affected by this change

[psalajova]

/lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: danilo-gemoli, psalajova

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[danilo-gemoli]

/retest

[openshift-ci]

@danilo-gemoli: all tests passed!

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