update gofmt to not search unnecessary places and report files changed

[hantaowang]

None

[k8s-ci-robot]

Hi @hantaowang. Thanks for your PR.

I'm waiting for a kubernetes-sigs or kubernetes 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[davidz627]

To ignore a whole directory tree, use -prune rather than checking every file in the tree. For example, to skip the directory 'src/emacs' and all files and directories under it, and print the names of the other files found, do something like this:
find . -path ./src/emacs -prune -o -print

Note that the pattern match test applies to the whole file name, starting from one of the start points named on the command line. It would only make sense to use an absolute path name here if the relevant start point is also an absolute path. This means that this command will never match anything:

lol

[davidz627]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: davidz627, hantaowang

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