fix bug: When executing tf-operator.v1 -version, GitSHA is always 'not provided'

[asdfsx]

After fix a small bug in release scripts, the git commit id can be set into GitSHA variable.
The GitSHA is not 'Not provided' anymore.

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This change is 

[k8s-ci-robot]

Hi @asdfsx. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[coveralls]

Coverage remained the same at 76.744% when pulling 0a20eef on asdfsx:update-release-scripts into eb02785 on kubeflow:master.

[gaocegege]

/ok-to-test

Thanks for your contribution! 🎉 👍

It bothers us several weeks.

/assign @richardsliu

[asdfsx]

/retest

[richardsliu]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: richardsliu

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