Default ticket_lifetime_hint to 0.
Default ticket_lifetime_hint to 0.

Summary:RFC5077:
  A value of zero is reserved to indicate that the lifetime of the ticket is unspecified.

Reviewed By: siyengar

Differential Revision: D3165268

fb-gh-sync-id: 8f6c8726e099d0978e8600501d255a8d8b14e997
fbshipit-source-id: 8f6c8726e099d0978e8600501d255a8d8b14e997

facebook/wangle,Dalzhim/wangle,Dalzhim/wangle,facebook/wangle,facebook/wangle