buildman: Sort the maintainer warnings

Sort the warnings into alphabetical order, for easier reading. Also make
sure that the buildman test files are ignored.

Signed-off-by: Simon Glass <sjg@chromium.org>
diff --git a/tools/buildman/boards.py b/tools/buildman/boards.py
index 422f347..269cafa 100644
--- a/tools/buildman/boards.py
+++ b/tools/buildman/boards.py
@@ -766,7 +766,7 @@
         """
         database = MaintainersDatabase()
         for (dirpath, _, filenames) in os.walk(srcdir):
-            if 'MAINTAINERS' in filenames:
+            if 'MAINTAINERS' in filenames and 'tools/buildman' not in dirpath:
                 database.parse_file(srcdir,
                                     os.path.join(dirpath, 'MAINTAINERS'))
 
@@ -779,7 +779,7 @@
             else:
                 params['status'] = '-'
             params_list[i] = params
-        return database.warnings
+        return sorted(database.warnings)
 
     @classmethod
     def format_and_output(cls, params_list, output):