1153344 - Allow Mongo connections over SSL.

https://bugzilla.redhat.com/show_bug.cgi?id=1153344
I had ssl commented out, and ssl_keyfile set correctly, and I received the error:

```
pulp.server.db.connection:CRITICAL: Database initialization failed: ssl has not been enabled but the following ssl parameters have been set: ssl_certfile, ssl_keyfile, ssl_cert_reqs, ssl_ca_certs. Please set `ssl=True` or remove.
```

I don't think this Implies ssl=True.