Add configuration for TLS session ticket encryption key, to allow#178

Merged

htuch merged 6 commits intoenvoyproxy:masterfrom

ggreenway:tls-ticket-key

Oct 3, 2017

Commits on Sep 25, 2017

Add configuration for TLS session ticket encryption key, to allow
ggreenway
committed

Commits on Sep 27, 2017

Move keys to their own message so the message can be used by KDS.
ggreenway
committed

Commits on Sep 28, 2017

Add documentation of the requirements of each key.
ggreenway
committed

Commits on Oct 3, 2017