ci: remove unused shell functions (#5062)

These functions have been unused since #4463

Author: devjgm

ci/kokoro/gcloud-functions.sh

@@ -65,49 +65,3 @@ create_gcloud_config() {
     "${GCLOUD}" "${GCLOUD_ARGS[@]}" --account="" config set project "${GOOGLE_CLOUD_PROJECT}"
   fi
 }
-
-cleanup_hmac_service_account() {
-  local -r ACCOUNT="$1"
-  io::log "Deleting account ${ACCOUNT}"
-  # We can ignore errors here, sometime the account exists, but the bindings
-  # are gone (or were never created). The binding is harmless if the account
-  # is deleted.
-  # retry up to 5 times with exponential backoff, initial interval 10s
-  "${PROJECT_ROOT}/ci/retry-command.sh" 5 10 \
-    "${GCLOUD}" "${GCLOUD_ARGS[@]}" projects remove-iam-policy-binding \
-    "${GOOGLE_CLOUD_PROJECT}" \
-    --member "serviceAccount:${ACCOUNT}" \
-    --role roles/iam.serviceAccountTokenCreator >/dev/null || true
-  "${PROJECT_ROOT}/ci/retry-command.sh" 5 10 \
-    "${GCLOUD}" "${GCLOUD_ARGS[@]}" iam service-accounts delete \
-    "${ACCOUNT}" >/dev/null
-}
-
-cleanup_stale_hmac_service_accounts() {
-  # The service accounts created below start with hmac-YYYYMMDD-, we list the
-  # accounts with that prefix, and with a date from at least 2 days ago to
-  # find and remove any stale accounts.
-  local THRESHOLD
-  THRESHOLD="$(date +%Y%m%d --date='2 days ago')"
-  readonly THRESHOLD
-  local email
-  "${GCLOUD}" "${GCLOUD_ARGS[@]}" iam service-accounts list \
-    --filter="email~^hmac-[0-9]{8}- AND email<hmac-${THRESHOLD}-" \
-    --format='csv(email)[no-heading]' |
-    while read -r email; do
-      cleanup_hmac_service_account "${email}"
-    done
-}
-
-create_hmac_service_account() {
-  local -r ACCOUNT="$1"
-  local -r EMAIL="${ACCOUNT}@${GOOGLE_CLOUD_PROJECT}.iam.gserviceaccount.com"
-  "${GCLOUD}" "${GCLOUD_ARGS[@]}" iam service-accounts create "${ACCOUNT}"
-  io::log "Grant service account permissions to create HMAC keys."
-  # retry up to 5 times with exponential backoff, initial interval 10s
-  "${PROJECT_ROOT}/ci/retry-command.sh" 5 10 \
-    "${GCLOUD}" "${GCLOUD_ARGS[@]}" projects add-iam-policy-binding \
-    "${GOOGLE_CLOUD_PROJECT}" \
-    --member "serviceAccount:${EMAIL}" \
-    --role roles/iam.serviceAccountTokenCreator >/dev/null
-}