2019-02-28, Version 6.17.0 'Boron' (LTS)

This is a security release. All Node.js users should consult the security
release summary at:

  https://nodejs.org/en/blog/vulnerability/february-2019-security-releases/

for details on patched vulnerabilities.

Fixes for the following CVEs are included in this release:

  * Node.js: Denial of Service with keep-alive HTTP connections
    (CVE-2019-5739)
  * Node.js: Slowloris HTTP Denial of Service with keep-alive
    (CVE-2019-5737)
  * OpenSSL: 0-byte record padding oracle (CVE-2019-1559)

Notable Changes:

* deps: OpenSSL has been upgraded to 1.0.2r which contains a fix for
  CVE-2019-1559 (https://www.openssl.org/news/secadv/20190226.txt). Under
  certain circumstances, a TLS server can be forced to respond differently to
  a client if a zero-byte record is received with an invalid padding
  compared to a zero-byte record with an invalid MAC. This can be used as the
  basis of a padding oracle attack to decrypt data.
* http:
  - Backport `server.keepAliveTimeo...