patman: Convert camel case in test_util.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/main.py b/tools/buildman/main.py
index c6af311..0127106 100755
--- a/tools/buildman/main.py
+++ b/tools/buildman/main.py
@@ -41,12 +41,12 @@
 
     # Run the entry tests first ,since these need to be the first to import the
     # 'entry' module.
-    test_util.RunTestSuites(
+    test_util.run_test_suites(
         result, False, verboose, False, None, test_name, [],
         [test.TestBuild, func_test.TestFunctional,
          'buildman.toolchain', 'patman.gitutil'])
 
-    return test_util.ReportResult('buildman', test_name, result)
+    return test_util.report_result('buildman', test_name, result)
 
 options, args = cmdline.ParseArgs()