This reverts commit ff6d73b989.
This brings back zuul inline status which is further optimized in
follow on patches. We do this in phases because it's a lot easier to
review that way.
It also introduces zuul_inline global control variable, so we can land
this turned off, and enable in the debugger to verify it's doing the
correct thing.
Change-Id: If951a4a05a7dfef7a6d0c8e15ed263ff0523165e
8400d7a184