switch to 4 space indent

Leave the recipes/ code at 2 space to match the rest of the recipes
project in other repos.

Reformatted using:
files=( $(
	git ls-tree -r --name-only HEAD | \
		grep -Ev -e '^(third_party|recipes)/' | \
		grep '\.py$';
	git grep -l '#!/usr/bin/env.*python' | grep -v '\.py$'
) )
parallel ./yapf -i -- "${files[@]}"
~/chromiumos/chromite/contrib/reflow_overlong_comments "${files[@]}"

The files that still had strings that were too long were manually
reformatted because they were easy and only a few issues.
autoninja.py
clang_format.py
download_from_google_storage.py
fix_encoding.py
gclient_utils.py
git_cache.py
git_common.py
git_map_branches.py
git_reparent_branch.py
gn.py
my_activity.py
owners_finder.py
presubmit_canned_checks.py
reclient_helper.py
reclientreport.py
roll_dep.py
rustfmt.py
siso.py
split_cl.py
subcommand.py
subprocess2.py
swift_format.py
upload_to_google_storage.py

These files still had lines (strings) that were too long, so the pylint
warnings were suppressed with a TODO.
auth.py
gclient.py
gclient_eval.py
gclient_paths.py
gclient_scm.py
gerrit_util.py
git_cl.py
presubmit_canned_checks.py
presubmit_support.py
scm.py

Change-Id: Ia6535c4f2c48d46b589ec1e791dde6c6b2ea858f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/4836379
Commit-Queue: Josip Sokcevic <sokcevic@chromium.org>
Auto-Submit: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Josip Sokcevic <sokcevic@chromium.org>
diff --git a/git_dates.py b/git_dates.py
index 41cf3ac..140e267 100644
--- a/git_dates.py
+++ b/git_dates.py
@@ -1,14 +1,13 @@
 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
-
 """Utility module for dealing with Git timestamps."""
 
 import datetime
 
 
 def timestamp_offset_to_datetime(timestamp, offset):
-  """Converts a timestamp + offset into a datetime.datetime.
+    """Converts a timestamp + offset into a datetime.datetime.
 
   Useful for dealing with the output of porcelain commands, which provide times
   as timestamp and offset strings.
@@ -20,43 +19,43 @@
   Returns:
     A tz-aware datetime.datetime for this timestamp.
   """
-  timestamp = int(timestamp)
-  tz = FixedOffsetTZ.from_offset_string(offset)
-  return datetime.datetime.fromtimestamp(timestamp, tz)
+    timestamp = int(timestamp)
+    tz = FixedOffsetTZ.from_offset_string(offset)
+    return datetime.datetime.fromtimestamp(timestamp, tz)
 
 
 def datetime_string(dt):
-  """Converts a tz-aware datetime.datetime into a string in git format."""
-  return dt.strftime('%Y-%m-%d %H:%M:%S %z')
+    """Converts a tz-aware datetime.datetime into a string in git format."""
+    return dt.strftime('%Y-%m-%d %H:%M:%S %z')
 
 
 # Adapted from: https://docs.python.org/2/library/datetime.html#tzinfo-objects
 class FixedOffsetTZ(datetime.tzinfo):
-  def __init__(self, offset, name):
-    datetime.tzinfo.__init__(self)
-    self.__offset = offset
-    self.__name = name
+    def __init__(self, offset, name):
+        datetime.tzinfo.__init__(self)
+        self.__offset = offset
+        self.__name = name
 
-  def __repr__(self):  # pragma: no cover
-    return '{}({!r}, {!r})'.format(type(self).__name__, self.__offset,
-                                   self.__name)
+    def __repr__(self):  # pragma: no cover
+        return '{}({!r}, {!r})'.format(
+            type(self).__name__, self.__offset, self.__name)
 
-  @classmethod
-  def from_offset_string(cls, offset):
-    try:
-      hours = int(offset[:-2])
-      minutes = int(offset[-2:])
-    except ValueError:
-      return cls(datetime.timedelta(0), 'UTC')
+    @classmethod
+    def from_offset_string(cls, offset):
+        try:
+            hours = int(offset[:-2])
+            minutes = int(offset[-2:])
+        except ValueError:
+            return cls(datetime.timedelta(0), 'UTC')
 
-    delta = datetime.timedelta(hours=hours, minutes=minutes)
-    return cls(delta, offset)
+        delta = datetime.timedelta(hours=hours, minutes=minutes)
+        return cls(delta, offset)
 
-  def utcoffset(self, dt):
-    return self.__offset
+    def utcoffset(self, dt):
+        return self.__offset
 
-  def tzname(self, dt):
-    return self.__name
+    def tzname(self, dt):
+        return self.__name
 
-  def dst(self, dt):
-    return datetime.timedelta(0)
+    def dst(self, dt):
+        return datetime.timedelta(0)