Upgrade openssl to 1.0.2f
This PR updates openssl to version 1.0.2f
This is in accordance with the security advisory that was posted in #4857 (closed)
It was done following the steps documented in https://github.com/TheAlphaNerd/node/blob/f48bce95eea9ad5b15a0872a194fa66623f0e5ba/deps/openssl/doc/UPGRADING.md