depot_tools: roll for newer pylint

BUG=chromium:1032148
TEST=`cros lint` works

Change-Id: I98ba3af9fc987cb65c21d6e338f14d18d20a12f5
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/manifest/+/1958850Reviewed-by: Michael Mortensen <mmortensen@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>

full.xml

@@ -485,7 +485,7 @@ Your sources have been sync'd successfully.
     -->
   <project path="src/chromium/depot_tools"
            name="chromium/tools/depot_tools"
-           revision="5ae4817ada0bd02f8c0d9f141d0f3c65701068a5"
+           revision="ed71210a5f9b875cfaad2ef9d7484e2c573cb692"
            remote="chromium"
            groups="minilayout,firmware,buildtools,labtools" />
   <project path="src/chromium/src/buildtools"