`AkkaHttpServer` didn't honour some HTTPS-related settings:

````
play {
  server {
    # HTTPS configuration
    https {
      # Whether JSSE want client auth mode should be used. This means, the server
      # will request a client certificate, but won't fail if one isn't provided.
      wantClientAuth = false

      # Whether JSSE need client auth mode should be used. This means, the server
      # will request a client certificate, and will fail and terminate the session
      # if one isn't provided.
      needClientAuth = false
    }
  }
}
```