Adds more docker py test

Addes more docker py test
Optimize test to import images from cache
Rename test class and dir for python unittest framework

Signed-off-by: Sujil02 <sushah@redhat.com>

test/test_dockerpy/common.py

@@ -0,0 +1,85 @@
+import docker
+import subprocess
+import os
+import sys
+import time
+from docker import Client
+from . import constant
+
+alpineDict = {
+      "name":        "docker.io/library/alpine:latest",
+		"shortName":   "alpine",
+		"tarballName": "alpine.tar"}
+
+def get_client():
+   client = docker.Client(base_url="http://localhost:8080",timeout=15)
+   return client
+
+client = get_client()
+
+def podman():
+    binary = os.getenv("PODMAN_BINARY")
+    if binary is None:
+        binary = "bin/podman"
+    return binary
+
+def restore_image_from_cache(TestClass):
+   alpineImage = os.path.join(constant.ImageCacheDir , alpineDict["tarballName"])
+   if not os.path.exists(alpineImage):
+      os.makedirs(constant.ImageCacheDir)
+      client.pull(constant.ALPINE)
+      response = client.get_image(constant.ALPINE)
+      image_tar = open(alpineImage,mode="wb")
+      image_tar.write(response.data)
+      image_tar.close()
+   else :
+      TestClass.podman = subprocess.run(
+      [
+            podman(), "load", "-i", alpineImage
+      ],
+      shell=False,
+      stdin=subprocess.DEVNULL,
+      stdout=subprocess.DEVNULL,
+      stderr=subprocess.DEVNULL,
+   )
+
+def run_top_container():
+   c = client.create_container(image=constant.ALPINE,command='/bin/sleep 5',name=constant.TOP)
+   client.start(container=c.get("Id"))
+   return c.get("Id")
+
+def enable_sock(TestClass):
+   TestClass.podman = subprocess.Popen(
+      [
+            podman(), "system", "service", "tcp:localhost:8080",
+            "--log-level=debug", "--time=0"
+      ],
+      shell=False,
+      stdin=subprocess.DEVNULL,
+      stdout=subprocess.DEVNULL,
+      stderr=subprocess.DEVNULL,
+   )
+   time.sleep(2)
+
+def terminate_connection(TestClass):
+   TestClass.podman.terminate()
+   stdout, stderr = TestClass.podman.communicate(timeout=0.5)
+   if stdout:
+      print("\nService Stdout:\n" + stdout.decode('utf-8'))
+   if stderr:
+      print("\nService Stderr:\n" + stderr.decode('utf-8'))
+
+   if TestClass.podman.returncode > 0:
+      sys.stderr.write("podman exited with error code {}\n".format(
+            TestClass.podman.returncode))
+      sys.exit(2)
+
+def remove_all_containers():
+   containers = client.containers(quiet=True)
+   for c in containers:
+      client.remove_container(container=c.get("Id"), force=True)
+
+def remove_all_images():
+   allImages = client.images()
+   for image in allImages:
+      client.remove_image(image,force=True)