SNI certificates were not being set in the database on listener update.
A listener GET would not show the certificates in the sni_container_refs
attribute. Also, the API was allowing set of SNI certs on non
TERMINATED_HTTPS listeners.
Task: 39042
Story: 2007421
Story: 2007430
Change-Id: If5b6411a0b7c75441a406234c2792ea68d35d0fe
(cherry picked from commit 9e070e6e6d)