binman: Rename the main module

Python does not like the module name being the same as the module
directory. To allow buildman modules to be used from other tools, rename
it.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/patman/test_util.py b/tools/patman/test_util.py
index 4d0085e..76dbc21 100644
--- a/tools/patman/test_util.py
+++ b/tools/patman/test_util.py
@@ -41,7 +41,7 @@
         glob_list = []
     glob_list += exclude_list
     glob_list += ['*libfdt.py', '*site-packages*', '*dist-packages*']
-    test_cmd = 'test' if 'binman.py' in prog else '-t'
+    test_cmd = 'test' if 'binman' in prog else '-t'
     cmd = ('PYTHONPATH=$PYTHONPATH:%s/sandbox_spl/tools %s-coverage run '
            '--omit "%s" %s %s -P1' % (build_dir, PYTHON, ','.join(glob_list),
                                       prog, test_cmd))