Move patch management functions into their own file, patch.py.

tests/svn_utils_test.py

Index: tests/svn_utils_test.py
diff --git a/tests/svn_utils_test.py b/tests/svn_utils_test.py
index 976e46f577a5b2559ad5e91f0e2595d3357a3126..e78bf50ae8f1563e327086086bb5c3471a746de9 100755
--- a/tests/svn_utils_test.py
+++ b/tests/svn_utils_test.py
@@ -14,7 +14,7 @@ import unittest
 ROOT_DIR = os.path.dirname(os.path.abspath(__file__))
 sys.path.append(os.path.join(ROOT_DIR, '..'))
 
-import pending_manager
+import patch
 import svn_utils
 
 PATCH = """\
@@ -56,8 +56,8 @@ class SvnUtils(unittest.TestCase):
     svn_utils.revert(url, self.root_dir, None, None)
     content = read(os.path.join(self.root_dir, 'svn_utils_test.txt'))
     self.assertTrue(os.path.join(self.root_dir, 'svn_utils_test.txt'))
-    svn_utils.apply_patch(
-        self.root_dir, pending_manager.auto_mangle_git_patch(PATCH))
+    patch.apply_patch(
+        self.root_dir, patch.auto_mangle_git_patch(PATCH))
     content_lines = content.splitlines(True)
     content_modified = ''.join(content_lines[0:5] + ['FOO!\n'] +
       content_lines[5:])