Fix python dockerpy tests

* Refactor packaging so unittest discovery works
* Refactor tests to use python3-docker.rpm that ships with Fedora32
* Flush image cache between tests suites
* Update documentation to reflect changes

Outstanding issue:
* client.get_image() does not fail if image does not exist

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

test/python/dockerpy/tests/test_images.py

@@ -0,0 +1,162 @@
+import os
+import stat
+import unittest
+from os import remove
+from stat import ST_SIZE
+
+import docker
+import requests
+
+from . import common, constant
+
+client = common.get_client()
+
+
+class TestImages(unittest.TestCase):
+    def setUp(self):
+        super().setUp()
+        common.restore_image_from_cache(self)
+
+    def tearDown(self):
+        common.remove_all_images()
+        return super().tearDown()
+
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+        common.enable_sock(cls)
+
+    @classmethod
+    def tearDownClass(cls):
+        common.terminate_connection(cls)
+        common.flush_image_cache(cls)
+        return super().tearDownClass()
+
+# Inspect Image
+
+    def test_inspect_image(self):
+        # Check for error with wrong image name
+        with self.assertRaises(requests.HTTPError):
+            client.inspect_image("dummy")
+        alpine_image = client.inspect_image(constant.ALPINE)
+        self.assertIn(constant.ALPINE, alpine_image["RepoTags"])
+
+# Tag Image
+
+# Validates if invalid image name is given a bad response is encountered.
+
+    def test_tag_invalid_image(self):
+        with self.assertRaises(requests.HTTPError):
+            client.tag("dummy", "demo")
+
+    #  Validates if the image is tagged successfully.
+    def test_tag_valid_image(self):
+        client.tag(constant.ALPINE, "demo", constant.ALPINE_SHORTNAME)
+        alpine_image = client.inspect_image(constant.ALPINE)
+        for x in alpine_image["RepoTags"]:
+            if ("demo:alpine" in x):
+                self.assertTrue
+        self.assertFalse
+
+    # Validates if name updates when the image is retagged.
+    @unittest.skip("dosent work now")
+    def test_retag_valid_image(self):
+        client.tag(constant.ALPINE_SHORTNAME, "demo", "rename")
+        alpine_image = client.inspect_image(constant.ALPINE)
+        self.assertNotIn("demo:test", alpine_image["RepoTags"])
+
+# List Image
+# List All Images
+
+    def test_list_images(self):
+        allImages = client.images()
+        self.assertEqual(len(allImages), 1)
+        # Add more images
+        client.pull(constant.BB)
+        allImages = client.images()
+        self.assertEqual(len(allImages), 2)
+
+        # List images with filter
+        filters = {'reference': 'alpine'}
+        allImages = client.images(filters=filters)
+        self.assertEqual(len(allImages), 1)
+
+# Search Image
+
+    def test_search_image(self):
+        response = client.search("alpine")
+        for i in response:
+            # Alpine found
+            if "docker.io/library/alpine" in i["Name"]:
+                self.assertTrue
+        self.assertFalse
+
+# Image Exist (No docker-py support yet)
+
+# Remove Image
+
+    def test_remove_image(self):
+        # Check for error with wrong image name
+        with self.assertRaises(requests.HTTPError):
+            client.remove_image("dummy")
+        allImages = client.images()
+        self.assertEqual(len(allImages), 1)
+        alpine_image = client.inspect_image(constant.ALPINE)
+        client.remove_image(alpine_image)
+        allImages = client.images()
+        self.assertEqual(len(allImages), 0)
+
+# Image History
+
+    def test_image_history(self):
+        # Check for error with wrong image name
+        with self.assertRaises(requests.HTTPError):
+            client.history("dummy")
+
+        imageHistory = client.history(constant.ALPINE)
+        alpine_image = client.inspect_image(constant.ALPINE)
+        for h in imageHistory:
+            if h["Id"] in alpine_image["Id"]:
+                self.assertTrue
+        self.assertFalse
+
+# Prune Image (No docker-py support yet)
+
+    def test_get_image_dummy(self):
+        # FIXME: seems to be an error in the library
+        self.skipTest("Documentation and library do not match")
+        # Check for error with wrong image name
+        with self.assertRaises(docker.errors.ImageNotFound):
+            client.get_image("dummy")
+
+# Export Image
+
+    def test_export_image(self):
+        client.pull(constant.BB)
+        if not os.path.exists(constant.ImageCacheDir):
+            os.makedirs(constant.ImageCacheDir)
+
+        image = client.get_image(constant.BB)
+
+        file = os.path.join(constant.ImageCacheDir, "busybox.tar")
+        tarball = open(file, mode="wb")
+        for frame in image:
+            tarball.write(frame)
+        tarball.close()
+        sz = os.path.getsize(file)
+        self.assertGreater(sz, 0)
+
+
+# Import|Load Image
+
+    def test_import_image(self):
+        allImages = client.images()
+        self.assertEqual(len(allImages), 1)
+        file = os.path.join(constant.ImageCacheDir, "alpine.tar")
+        client.import_image_from_file(filename=file)
+        allImages = client.images()
+        self.assertEqual(len(allImages), 2)
+
+if __name__ == '__main__':
+    # Setup temporary space
+    unittest.main()