pyln-testing: Copy basic support infrastructure into pyln.testing

We'll rewrite the tests to use this infrastructure in the next commit.

Changelog-Added: The new `pyln-testing` package now contains the testing infrastructure so it can be reused to test against c-lighting in external projects

contrib/pyln-testing/setup.py

@@ -0,0 +1,22 @@
+from setuptools import setup
+from pyln.testing import __version__
+
+
+with open('README.md', encoding='utf-8') as f:
+    long_description = f.read()
+
+with open('requirements.txt', 'r') as f:
+    requirements = [l.strip() for l in f]
+
+setup(name='pyln-testing',
+      version=__version__,
+      description='Library to facilitate writing tests for for lightningd',
+      long_description=long_description,
+      long_description_content_type='text/markdown',
+      url='http://github.com/ElementsProject/lightning',
+      author='Christian Decker',
+      author_email='decker.christian@gmail.com',
+      install_requires=requirements,
+      license='MIT',
+      packages=['pyln.testing'],
+      zip_safe=True)