message: CHANGE default loglevel to 'error' and make it configurable
diff: import log from 'npmlog';
  import { getProductVariables } from './cli';
  -log.level = process.env.DISABLE_LOGGING === 'true' ? 'silent' : 'verbose';
  +log.level = process.env.DISABLE_LOGGING === 'true' ? 'silent' : process.env.LOG_LEVEL || 'error';
  export function createLogger(prefix) {
  log.heading = prefix;
  