MongoDB collector must allow configuration of ssl options

[Grumblesmith]

The MongoDB collector allows you to turn on SSL, but does not permit options such as ssl_certfile, ssl_keyfile, ssl_pem_passphrase, ssl_ca_certs, ssl_crlfile, or ssl_cert_reqs. Several of these are required for connecting to MongoDB instances provided through services such as Compose.io

[Grumblesmith]

@shawnbutts I think this was fixed, right?