patchtest: Add tests from patchtest oe repo

Copy the core components of the patchtest-oe repo into
meta/lib/patchtest in oe-core.

(From OE-Core rev: 257f64f4e4414b78981104aec132b067beb5a92a)

Signed-off-by: Trevor Gamblin <tgamblin@baylibre.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/patchtest/tests/test_mbox_author.py

@@ -0,0 +1,29 @@
+# Checks related to the patch's author
+#
+# Copyright (C) 2016 Intel Corporation
+#
+# SPDX-License-Identifier: GPL-2.0
+
+import base
+import re
+
+class Author(base.Base):
+
+    auh_email = '<auh@auh.yoctoproject.org>'
+
+    invalids = [re.compile("^Upgrade Helper.+"),
+                re.compile(re.escape(auh_email)),
+                re.compile("uh@not\.set"),
+                re.compile("\S+@example\.com")]
+
+
+    def test_author_valid(self):
+        for commit in self.commits:
+            for invalid in self.invalids:
+                if invalid.search(commit.author):
+                    self.fail('Invalid author %s' % commit.author, 'Resend the series with a valid patch\'s author', commit)
+
+    def test_non_auh_upgrade(self):
+        for commit in self.commits:
+            if self.auh_email in commit.payload:
+                self.fail('Invalid author %s in commit message' % self.auh_email, 'Resend the series with a valid patch\'s author', commit)