Load shellcheck configuration from the .shellcheckrc

[alexandear]

What type of PR is this?

/kind cleanup

What this PR does / why we need it:

Add .shelcheckrc to store shellcheck configuration to improve readability and maintainability.

Which issue(s) this PR fixes:

Updates #1518

Special notes for your reviewer:

I'm aware that the Kubernetes project uses the SHELLCHECK_DISABLED variable in hack/verify-shellcheck.sh to ignore issues, rather than using a .shellcheckrc file. This is due to historical reasons: when Kubernetes first introduced shellcheck, it did not support config files.

Does this PR introduce a user-facing change?

NONE

[k8s-ci-robot]

Hi @alexandear. Thanks for your PR.

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[tenzen-y]

/ok-to-test cc: @Vandit1604

[tenzen-y]

@alexandear Could you rebase this PR? Because we added a new make target for the CI.

[k8s-ci-robot]

LGTM label has been added.

Git tree hash: cdd517ab3a5e8465e3695cfe8068c31ecf766241

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: alexandear, tenzen-y

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