python-parsley: add python3 variant

Signed-off-by: Jeffery To <jeffery.to@gmail.com>

lang/python/python-parsley/patches/002-omit-tests.patch

@@ -0,0 +1,11 @@
+--- a/setup.py
++++ b/setup.py
+@@ -15,7 +15,6 @@ setup(
+     author_email="washort42@gmail.com",
+     license="MIT License",
+     long_description=io.open("README", encoding="utf-8").read(),
+-    packages=["ometa", "terml", "ometa._generated", "terml._generated",
+-              "ometa.test", "terml.test"],
++    packages=["ometa", "terml", "ometa._generated", "terml._generated"],
+     py_modules=["parsley"]
+ )