🐛 fix loading CRDs from multiple directories in envtests

[xrstf]

In #1888 I accidentally changed the semantics of files, which was previously always overridden with the result from ioutil.ReadDir, but is now only ever append()ed to. This causes problems when reading CRDs from multiple directories.

This PR changes the scope for the variables to fix that bug. So sorry to have broken the 0.12 release :(

[k8s-ci-robot]

Hi @xrstf. Thanks for your PR.

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[camilamacedo86]

/ok-to-test

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alvaroaleman, xrstf

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[alvaroaleman]

/cherrypick release-0.12

[k8s-infra-cherrypick-robot]

@alvaroaleman: new pull request created: #1905

In response to this:

/cherrypick release-0.12

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