Remove flag arg from ticket init
Remove flag arg from ticket init

Summary:
I checked the callsites and every single one passes in true here, so the method
can just unconditionally initialize the server with the value of the current
ticket secrets. Honestly, I'm not even sure what use case there is for not
trying to initialize them?

Reviewed By: yfeldblum, mingtaoy

Differential Revision: D29202304

fbshipit-source-id: 161866b436f327bac34d5eae861636c2515743a0

facebook/mcrouter,facebook/mcrouter,facebook/mcrouter,facebook/mcrouter