This reverts commit 3899f1bc.

Reason for revert: causing PRESUBMIT error on catapult repo 

BUG:chromium:865897

Original change's description:
> pylint: upgrade to 1.5.6
> 
> We disable new warnings that are triggered in depot_tools to pylintrc.
> So the lint output before & after this CL are mostly unchanged.  The
> repos checked: depot_tools, src, and build.
> 
> Also update astroid to 1.4.9 and drop logilab.common as needed.
> 
> Bug: 863669
> Change-Id: Ib602560c1bcad5a9e8b6ca731d9465f43220f044
> Reviewed-on: https://chromium-review.googlesource.com/1137382
> Reviewed-by: John Budorick <jbudorick@chromium.org>
> Reviewed-by: Robbie Iannucci <iannucci@chromium.org>
> Commit-Queue: Mike Frysinger <vapier@chromium.org>

TBR=vapier@chromium.org,iannucci@chromium.org,jbudorick@chromium.org

Change-Id: I8ea087123db4e52fdf7ebff8b1ed356fd60a6059
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 863669
Reviewed-on: https://chromium-review.googlesource.com/1145160Reviewed-by: Ned Nguyen <nednguyen@google.com>
Commit-Queue: Ned Nguyen <nednguyen@google.com>