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/pyparsing/parse_shortlog.py

@@ -0,0 +1,14 @@
+# subject pyparsing definition
+#
+# Copyright (C) 2016 Intel Corporation
+#
+# SPDX-License-Identifier: GPL-2.0
+
+# NOTE:This is an oversimplified syntax of the mbox's summary
+
+import pyparsing
+import common
+
+target        = pyparsing.OneOrMore(pyparsing.Word(pyparsing.printables.replace(':','')))
+summary       = pyparsing.OneOrMore(pyparsing.Word(pyparsing.printables))
+shortlog       = common.start + target + common.colon + summary + common.end