Use kube::util::array_contains() in hack

The common kube::util::array_contains() is already there, so this
makes both scripts use it.

hack/verify-shellcheck.sh

@@ -88,20 +88,6 @@ while IFS=$'\n' read -r script;
   do failing_files+=("$script");
 done < <(cat "${failure_file}")
 
-# TODO(bentheelder): we should probably move this and the copy in verify-golint.sh
-# to one of the bash libs
-array_contains () {
-  local seeking=$1; shift # shift will iterate through the array
-  local in=1 # in holds the exit status for the function
-  for element; do
-    if [[ "$element" == "$seeking" ]]; then
-      in=0 # set in to 0 since we found it
-      break
-    fi
-  done
-  return $in
-}
-
 # detect if the host machine has the required shellcheck version installed
 # if so, we will use that instead.
 HAVE_SHELLCHECK=false
@@ -143,7 +129,7 @@ for f in "${all_shell_scripts[@]}"; do
                  shellcheck --exclude="${SHELLCHECK_DISABLED}" "${f}")
   fi  
   set -o errexit
-  array_contains "${f}" "${failing_files[@]}" && in_failing=$? || in_failing=$?
+  kube::util::array_contains "${f}" "${failing_files[@]}" && in_failing=$? || in_failing=$?
   if [[ -n "${failedLint}" ]] && [[ "${in_failing}" -ne "0" ]]; then
     errors+=( "${failedLint}" )
   fi
@@ -185,7 +171,7 @@ fi
 # Check that all failing_packages actually still exist
 gone=()
 for f in "${failing_files[@]}"; do
-  array_contains "$f" "${all_shell_scripts[@]}" || gone+=( "$f" )
+  kube::util::array_contains "$f" "${all_shell_scripts[@]}" || gone+=( "$f" )
 done
 
 if [[ ${#gone[@]} -gt 0 ]]; then