parse HMD_LDAP_SEARCHATTRIBUTES env var as a comma-separated array

Signed-off-by: Alec WM <firstcontact@owls.io>

lib/config/utils.js

@@ -6,3 +6,10 @@ exports.toBooleanConfig = function toBooleanConfig (configValue) {
   }
   return configValue
 }
+
+exports.toArrayConfig = function toArrayConfig (configValue, separator = ',', fallback) {
+  if (configValue && typeof configValue === 'string') {
+    return (configValue.split(separator).map(arrayItem => arrayItem.trim()))
+  }
+  return fallback
+}