R1:4c7c518c6370

Throw a richer exception when updating tasks with expired leases

Summary: Include task ID and class when raising this exception. I took a brief stab at doing this generically, but (a) we specifically raise this exception outside of normal try/catch because we can't follow normal recovery rules for it and (b) we don't have a reasonable PhutilProxyException or similar right now which would preserve stack traces, and don't have builtin exception nesting support until PHP 5.3.

Test Plan: Faked this exception…