Resolves #553, Resolves #546 - bug fixes with unit tests

Signed-off-by: Daniel Nephin <dnephin@gmail.com>

tests/unit/cli/docker_client_test.py

@@ -0,0 +1,16 @@
+from __future__ import unicode_literals
+from __future__ import absolute_import
+import os
+
+import mock
+from tests import unittest
+
+from fig.cli import docker_client 
+
+
+class DockerClientTestCase(unittest.TestCase):
+
+    def test_docker_client_no_home(self):
+        with mock.patch.dict(os.environ):
+            del os.environ['HOME']
+            docker_client.docker_client()