Fix git commit hash ignored

[Shell32-Natsu]

#2444
#2494

[k8s-ci-robot]

Hi @Shell32-Natsu. Thanks for your PR.

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[Shell32-Natsu]

/assign @Liujingfang1

[k8s-ci-robot]

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[monopole]

/ok-to-test

[monopole]

This code has been pulled in various directions. #857 (which added --depth 1) was a performance enhancement. An old use of go-getter was removed because it exploded the vendor directory in used at the time with excessive deps. We'll try this and see what happens.

/lgtm

[JTarasovic]

built kustomize locally and tested against a couple of repos with kustomization.yamls

• commit hash: appears to use correct ref (no diff from our pegged version w/ v0.5.1)
• branch ref: looks to pull correct branch
• no ref: pulls default branch