account for upstream server TLS option changes (#29)

Author: lerouxb

docker/tls/mongod-server.conf

@@ -4,6 +4,7 @@ net:
   tls:
     mode: requireTLS
     certificateKeyFile: /etc/mongod/tls/server.pem
+    CAFile: /etc/mongod/tls/ca.pem
     allowInvalidCertificates: true
     allowInvalidHostnames: true