Import the camptocamp openssl module version 0.3.1.

It is a new module that will be used to manage SSL keys and
certificates. It allows:
  - The generation of SSL keys,
  - The generation of SSL certificate from private key
  - The generation of SSL certificate signing request

Change-Id: I4a6a7b78d58fd17ea133421bc326fe2d3d65b409
Implements: blueprint ssl-endpoints
Merge "Import the camptocamp openssl module version 0.3.1."