pkg/resources-fix staticcheck

[Aresforchina]

ref:#7800
errors from staticcheck
pkg/resources/digitalocean/cloud.go:59:2: field tags is unused (U1000)
pkg/resources/digitalocean/dns/dns.go:508:6: func editRecord is unused (U1000)
pkg/resources/digitalocean/resources.go:320:19: using time.Tick leaks the underlying ticker, consider using it only in endless functions, tests and the main package, and use time.NewTicker here (SA1015)
invalid operation: cannot receive from non-channel tick (variable of type *time.Ticker)

[k8s-ci-robot]

Hi @Aresforchina. Thanks for your PR.

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[Aresforchina]

/assign @Justins

[k8s-ci-robot]

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/assign @Justins

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[tanjunchen]

/ok-to-test

[Aresforchina]

/retest

[rifelpet]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Aresforchina, rifelpet

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[Aresforchina]

/test pull-kops-verify-generated

[rifelpet]

/lgtm