1. Fixes the mismatch between the tls_container_id lengths in neutron.lbaas_sni
and octavia.sni tables.
2. Fixes the syntax error in cert_parser.py field. (tls_container.id => tls_container_id)
3. Removes the certs['sni_certs'] parameter from the rest_api_driver.py as it gets wrongly
assigned to socket_path parameter in the jinja_cfg.py file.
4. Modifies the sample_configs to make the unit tests work with the above changes.
Change-Id: I8fe5854ef2dc508e37a368294c44eef63b5bccba
Closes-Bug: #1520990