http: restore CRLF export

Author: wlgh1553

lib/_http_common.js

@@ -262,6 +262,7 @@ module.exports = {
  _checkIsHttpToken: checkIsHttpToken,
  chunkExpression: /(?:^|\W)chunked(?:$|\W)/i,
  continueExpression: /(?:^|\W)100-continue(?:$|\W)/i,
+ CRLF: '\r\n', // TODO: Deprecate this.
  freeParser,
  methods,
  parsers,