fix: use /etc/containers/certs.d as default option

[jonyhy96]

What this PR does / why we need it:

See #10116

Which issue(s) this PR fixes:

Fixes #10116

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[vrothberg]

That is fixing a problem that does not exist. See my other comment: #10116 (comment)

I should have elaborated more. The certs dir is used but the defaults are set in containers/image, so Podman does not need to set anything.

I suggest to close this PR.

[rhatdan]

Why not change this PR to update the man pages so the man pages list this directory as default.

docs/source/markdown/podman-container-runlabel.1.md:#### --cert-dir=path
docs/source/markdown/podman-image-sign.1.md:#### --cert-dir=path
docs/source/markdown/podman-login.1.md:#### --cert-dir=path
docs/source/markdown/podman-manifest-add.1.md:#### --cert-dir=path
docs/source/markdown/podman-manifest-push.1.md:#### --cert-dir=path
docs/source/markdown/podman-pull.1.md:#### --cert-dir=path
docs/source/markdown/podman-push.1.md:#### --cert-dir=path
docs/source/markdown/podman-build.1.md:#### --cert-dir=path
docs/source/markdown/podman-play-kube.1.md:#### --cert-dir=path