command: rename decorator style

We're moving from old CamelCase to snake_case for decorators to match
updated style guide, so rename the command decorator to match.

BUG=b:187789324
TEST=CQ passes

Change-Id: If8a0deb95307ceb04d616c6a7f2632dd3bd88b60
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/3337920
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Sergey Frolov <sfrolov@google.com>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
diff --git a/cli/command_unittest.py b/cli/command_unittest.py
index 98890ca..5adea52 100644
--- a/cli/command_unittest.py
+++ b/cli/command_unittest.py
@@ -19,7 +19,7 @@
 _COMMAND_NAME = 'superAwesomeCommandOfFunness'
 
 
-@command.CommandDecorator(_COMMAND_NAME)
+@command.command_decorator(_COMMAND_NAME)
 class TestCommand(command.CliCommand):
   """A fake command."""
   def Run(self):
@@ -45,14 +45,14 @@
     """Tests that our decorator correctly rejects bad test commands."""
     try:
       # pylint: disable=unused-variable
-      @command.CommandDecorator('bad')
+      @command.command_decorator('bad')
       class BadTestCommand(object):
         """A command that wasn't implemented correctly."""
 
     except command.InvalidCommandError:
       pass
     else:
-      self.fail('Invalid command was accepted by the CommandDecorator')
+      self.fail('Invalid command was accepted by @command_decorator')
 
   def testAddDeviceArgument(self):
     """Tests CliCommand.AddDeviceArgument()."""