Configure SSL support for networking API

OpenStack Networking supports SSL for the Networking API server. By default, SSL is disabled but you can enable it in the neutron.conf file.

Set these options to configure SSL:

use_ssl = True: Enables SSL on the networking API server.
ssl_cert_file = /path/to/certfile: Certificate file that is used when you securely start the Networking API server.
ssl_key_file = /path/to/keyfile: Private key file that is used when you securely start the Networking API server.
ssl_ca_file = /path/to/cafile: Optional. CA certificate file that is used when you securely start the Networking API server. This file verifies connecting clients. Set this option when API clients must authenticate to the API server by using SSL certificates that are signed by a trusted CA.
tcp_keepidle = 600: The value of TCP_KEEPIDLE, in seconds, for each server socket when starting the API server. Not supported on OS X.
retry_until_window = 30: Number of seconds to keep retrying to listen.
backlog = 4096: Number of backlog requests with with to configure the socket.