Add a CPU timer to RequestInjectionData

Summary: We'd like to be able to kill a runaway CPU-eating request before it
hits the full wall-time timeout.  Requests generally use a lot less CPU than
wall time, so we should be able to be more aggressive with it.

Reviewed By: @markw65

Differential Revision: D1702049
Quote the path passed to hh_server

Summary: When hh_client spawns a server, quote the path so that paths with spaces in the
name are correctly handled.

Fixes #4310

Closes https://github.com/facebook/hhvm/pull/4321

Reviewed By: @​svcscm

Differential Revision: D1701186

Pulled By: @int3