Log Message:
Update lang/nodejs6 to 6.11.2.

### Notable Changes

- configure:
  - add mips64el to valid_arch
- crypto:
  - Updated root certificates based on NSS 3.30
- deps:
  - upgrade OpenSSL to version 1.0.2.l
- http:
  - parse errors are now reported when NODE_DEBUG=http
  - Agent construction can now be envoked without `new`
- zlib:
  - node will now throw an Error when zlib rejects the value of
    windowBits, instead of crashing