cros lint: check the indentation level of section arguments

Sometimes the indentation of things like "Args:" is incorrect.
Add a linter check for it and fix up all the existing errors.

BUG=chromium:485005
TEST=`cros lint` on all files pass, and catches some bad cases

Change-Id: I79ea60d1e07c40d9283284bdaebfcda5af4e6246
Reviewed-on: https://chromium-review.googlesource.com/269642
Trybot-Ready: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Prathmesh Prabhu <pprabhu@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
diff --git a/cli/flash.py b/cli/flash.py
index 2b12194..88a4505 100644
--- a/cli/flash.py
+++ b/cli/flash.py
@@ -495,8 +495,8 @@
     for base images.
 
     Args:
-       device: A ChromiumOSDevice object.
-       tempdir: A temporary directory to store files.
+      device: A ChromiumOSDevice object.
+      tempdir: A temporary directory to store files.
 
     Returns:
       True if we can start devserver; False otherwise.