Revert "Use pylint 2.7 for depot_tools"

This reverts commit 22bf605bb63f8ff01aa7c1a2841718e3489b43d6.

Reason for revert: breaks gclient sync

Original change's description:
> Use pylint 2.7 for depot_tools
>
> This includes a few fixes for specific errors, and disables several new
> warnings introduced in this version, in order to allow for an incremental migration.
>
> Bug:1262286
> Change-Id: Ie97d686748c9c952e87718a65f401c5f6f80a5c9
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3400616
> Reviewed-by: Gavin Mak <gavinmak@google.com>
> Commit-Queue: Aravind Vasudevan <aravindvasudev@google.com>

Bug: 1262286
Change-Id: Ieb946073c7886c7bf056ce843a5a48e82becf7a5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3413672
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Josip Sokcevic <sokcevic@google.com>
diff --git a/compile_single_file.py b/compile_single_file.py
index eba8e90..bb0a541 100644
--- a/compile_single_file.py
+++ b/compile_single_file.py
@@ -23,7 +23,7 @@
   # to break when we rename directories.
   fingerprints = ['chrome', 'net', 'v8', 'build', 'skia']
   while candidate and not all(
-      os.path.isdir(os.path.join(candidate, fp)) for fp in fingerprints):
+      [os.path.isdir(os.path.join(candidate, fp)) for fp in fingerprints]):
     new_candidate = os.path.dirname(candidate)
     if new_candidate == candidate:
       raise Exception("Couldn't find source-dir from %s" % path)