The README documentation implies that use-https and
https-service-endpoints are required when enabling SSL/https
with your own CA, SSL cert, and key. Update the README and
config.yaml to explain that config options use-https and
https-service-endpoints should not be set when using ssl_*
config options.

Change-Id: I2e0140f909ef2c57182895f37cf191b6bc80157b
Closes-Bug: #1754682