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_system.py

@@ -0,0 +1,49 @@
+import os
+import unittest
+
+import varlink
+
+import podman
+
+
+class TestSystem(unittest.TestCase):
+    def setUp(self):
+        self.host = os.environ['PODMAN_HOST']
+
+    def tearDown(self):
+        pass
+
+    def test_bad_address(self):
+        with self.assertRaisesRegex(varlink.client.ConnectionError,
+                                    "Invalid address 'bad address'"):
+            podman.Client('bad address')
+
+    def test_ping(self):
+        with podman.Client(self.host) as pclient:
+            self.assertTrue(pclient.system.ping())
+
+    def test_versions(self):
+        with podman.Client(self.host) as pclient:
+            # Values change with each build so we cannot test too much
+            self.assertListEqual(
+                sorted([
+                    'built', 'client_version', 'git_commit', 'go_version',
+                    'os_arch', 'version'
+                ]), sorted(list(pclient.system.versions._fields)))
+            pclient.system.versions
+        self.assertIsNot(podman.__version__, '0.0.0')
+
+    def test_info(self):
+        with podman.Client(self.host) as pclient:
+            actual = pclient.system.info()
+            # Values change too much to do exhaustive testing
+            self.assertIsNotNone(actual.podman['go_version'])
+            self.assertListEqual(
+                sorted([
+                    'host', 'insecure_registries', 'podman', 'registries',
+                    'store'
+                ]), sorted(list(actual._fields)))
+
+
+if __name__ == '__main__':
+    unittest.main()