buildman: Convert camel case in control.py

Convert this file to snake case and update all files which use it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/test.py b/tools/buildman/test.py
index 9fa6445..7eb25aa 100644
--- a/tools/buildman/test.py
+++ b/tools/buildman/test.py
@@ -465,7 +465,7 @@
         options.show_errors = False
         options.keep_outputs = False
         args = ['tegra20']
-        control.DoBuildman(options, args)
+        control.do_buildman(options, args)
 
     def testBoardSingle(self):
         """Test single board selection"""