Upgrading to OpenSSL 1.0.2a - https://www.openssl.org/news/secadv_20150319.txt

We'll have to be extra careful when reviewing future pull requests that people aren't reverting that one by accident. It's going to be a common issue.

openssl @ 3df69d3a

-Subproject commit 4ac0329582829f5378d8078c8d314ad37db87736
+Subproject commit 3df69d3aefde7671053d4e3c242b228e5d79c83f