add yum.conf options for smaller image

[yazug]

• keepcache=0 instructs yum/dnf to not keep the cache at all
• install_weak_deps on rhel 8 ends up pulling in unnecessary X11 related bits

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[elfosardo]

let's hold on to this until the CI works again
also with the change to dnf from yum #30 , the default for keepcache is False, so no need to add the option
we might want to consider it though for the original image in metal3-io, at least until we use centos 7 and yum

[dtantsur]

With metal3-io#100 approved, I think this should go to the upstream image first.

[openshift-ci-robot]

@yazug: PR needs rebase.

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[dtantsur]

It's setopt, not setopts.

[openshift-ci-robot]

@yazug: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-metal-ipi	0cfe357	link	/test e2e-metal-ipi

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[stbenjam]

This looks like it might be useful, any chance to revisit this? Needs a rebase

[elfosardo]

this is obsolete as we use dnf now, the default for keepcache is False, so I don't think we need it anymore

[stbenjam]

/close

[openshift-ci-robot]

@stbenjam: Closed this PR.

In response to this:

/close

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[stbenjam]

Feel free to rebase and reopen if it makes sense for dnf