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_bugzilla.py

@@ -0,0 +1,22 @@
+# Checks related to the patch's bugzilla tag
+#
+# Copyright (C) 2016 Intel Corporation
+#
+# SPDX-License-Identifier: GPL-2.0
+
+import re
+import base
+
+class Bugzilla(base.Base):
+    rexp_detect     = re.compile("\[\s?YOCTO.*\]", re.IGNORECASE)
+    rexp_validation = re.compile("\[(\s?YOCTO\s?#\s?(\d+)\s?,?)+\]", re.IGNORECASE)
+
+    def test_bugzilla_entry_format(self):
+        for commit in Bugzilla.commits:
+            for line in commit.commit_message.splitlines():
+                if self.rexp_detect.match(line):
+                    if not self.rexp_validation.match(line):
+                        self.fail('Yocto Project bugzilla tag is not correctly formatted',
+                                  'Specify bugzilla ID in commit description with format: "[YOCTO #<bugzilla ID>]"',
+                                  commit)
+