Refactor libpod python varlink bindings

- More pythonic
- Leverage context managers to help with socket leaks
- Add system unittest's
- Add image unittest's
- Add container unittest's
- Add models for system, containers and images, and their collections
- Add helper functions for datetime parsing/formatting
- GetInfo() implemented
- Add support for setuptools
- Update documentation
- Support for Python 3.4-3.6

Signed-off-by: Jhon Honce <jhonce@redhat.com>

Closes: #748
Approved by: baude

contrib/python/test/test_libs.py

@@ -0,0 +1,46 @@
+import datetime
+import unittest
+
+import podman
+
+
+class TestLibs(unittest.TestCase):
+    def setUp(self):
+        pass
+
+    def tearDown(self):
+        pass
+
+    def test_parse(self):
+        expected = datetime.datetime.strptime(
+            '2018-05-08T14:12:53.797795-0700', '%Y-%m-%dT%H:%M:%S.%f%z')
+        for v in [
+                '2018-05-08T14:12:53.797795191-07:00',
+                '2018-05-08T14:12:53.797795-07:00',
+                '2018-05-08T14:12:53.797795-0700',
+                '2018-05-08 14:12:53.797795191 -0700 MST'
+        ]:
+            actual = podman.datetime_parse(v)
+            self.assertEqual(actual, expected)
+
+            podman.datetime_parse(datetime.datetime.now().isoformat())
+
+    def test_parse_fail(self):
+        # chronologist humor: '1752-09-05T12:00:00.000000-0000' also not
+        #   handled correctly by python for my locale.
+        for v in [
+                '1752-9-5',
+                '1752-09-05',
+        ]:
+            with self.assertRaises(ValueError):
+                podman.datetime_parse(v)
+
+    def test_format(self):
+        expected = '2018-05-08T18:24:52.753227-07:00'
+        dt = podman.datetime_parse(expected)
+        actual = podman.datetime_format(dt)
+        self.assertEqual(actual, expected)
+
+
+if __name__ == '__main__':
+    unittest.main()