This reverts commit 8b5b5941.

Reason for revert: nothing wrong with this CL, but implementing a manual roll to build.git takes more than 20 min. I will reland this CL once my roll to build.git CL is ready

Original change's description:
> add "generic" infra path config
> 
> It proved to be dangerous to introduce conditional logic into recipes
> and recipe modules to alternate between buildbot and luci modes, namely
> it touches buildbot code paths, which can be very dangerous.
> 
> Instead, introduce "generic" default path config that configures
> existing base paths from the built-in ones.
> 
> Also remove swarmbucket path config because it is not used.
> 
> R=​iannucci@chromium.org
> BUG=660481
> 
> Change-Id: Ide0e1f64913fe35766b997ab5b55f01f4c63aa58
> Reviewed-on: https://chromium-review.googlesource.com/459234
> Commit-Queue: Nodir Turakulov <nodir@chromium.org>
> Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
> 

TBR=iannucci@chromium.org,nodir@chromium.org,chromium-reviews@chromium.org
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=660481

Change-Id: If27a537689dfe3669015bcbc7a5f07ca1f5c10af
Reviewed-on: https://chromium-review.googlesource.com/461223Reviewed-by: Nodir Turakulov <nodir@chromium.org>
Commit-Queue: Nodir Turakulov <nodir@chromium.org>

It proved to be dangerous to introduce conditional logic into recipes
and recipe modules to alternate between buildbot and luci modes, namely
it touches buildbot code paths, which can be very dangerous.

Instead, introduce "generic" default path config that configures
existing base paths from the built-in ones.

Also remove swarmbucket path config because it is not used.

R=iannucci@chromium.org
BUG=660481

Change-Id: Ide0e1f64913fe35766b997ab5b55f01f4c63aa58
Reviewed-on: https://chromium-review.googlesource.com/459234
Commit-Queue: Nodir Turakulov <nodir@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>

This will help remove confusion when depot_tools' recipes.py
ends up in PATH.

BUG=699120

Change-Id: Id4c21b0cc6bb022ea2c21145abe76bebb0a8d9c1
Reviewed-on: https://chromium-review.googlesource.com/458430
Commit-Queue: Paweł Hajdan Jr. <phajdan.jr@chromium.org>
Reviewed-by: Robbie Iannucci <iannucci@chromium.org>