patman: add distutils based installer

To make it easier to use patman on other projects add a distutils style
installer. Now patman can be installed with

  cd u-boot/tools/patman && python setup.py install

There are also the usual distutils options for creating source/binary
distributions of patman.
Tested-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Acked-by: Simon Glass <sjg@chromium.org>

tools/patman/README

@@ -135,6 +135,17 @@ Similar to the above, but skip the first commit and take the next 5. This
 is useful if your top commit is for setting up testing.
 
 
+How to install it
+=================
+
+The most up to date version of patman can be found in the U-boot sources.
+However to use it on other projects it may be more convenient to install it as
+a standalone application. A distutils installer is included, this can be used
+to install patman:
+
+$ cd tools/patman && python setup.py install
+
+
 How to add tags
 ===============
 

tools/patman/__init__.py

+__all__ = ['checkpatch', 'command', 'commit', 'cros_subprocess',
+           'get_maintainer', 'gitutil', 'patchstream', 'project',
+           'series', 'settings', 'terminal', 'test']

tools/patman/patman.py

@@ -14,14 +14,18 @@ import sys
 import unittest
 
 # Our modules
-import checkpatch
-import command
-import gitutil
-import patchstream
-import project
-import settings
-import terminal
-import test
+try:
+    from patman import checkpatch, command, gitutil, patchstream, \
+        project, settings, terminal, test
+except ImportError:
+    import checkpatch
+    import command
+    import gitutil
+    import patchstream
+    import project
+    import settings
+    import terminal
+    import test
 
 
 parser = OptionParser()

tools/patman/setup.py

+#
+# SPDX-License-Identifier:      GPL-2.0+
+#
+from distutils.core import setup
+setup(name='patman',
+      version='1.0',
+      license='GPL-2.0+',
+      scripts=['patman'],
+      packages=['patman'],
+      package_dir={'patman': ''},
+      package_data={'patman': ['README']},
+      classifiers=['Environment :: Console',
+                   'Topic :: Software Development'])