Fixing relative path bug when looking up library version

This change fixes the use of relative paths used to fetch the PyKMIP
library version number in kmip/__init__.py and setup.py. The absolute
path of the file is now dynamically generated and used instead. Tests
are included to verify that the __version__ attribute is set properly.

kmip/tests/unit/test_kmip.py

@@ -0,0 +1,43 @@
+# Copyright (c) 2015 The Johns Hopkins University/Applied Physics Laboratory
+# All Rights Reserved.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#    http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+from testtools import TestCase
+
+
+class TestKMIP(TestCase):
+    """
+    A test suite for the overall `kmip` module.
+    """
+
+    def setUp(self):
+        super(TestKMIP, self).setUp()
+
+    def tearDown(self):
+        super(TestKMIP, self).tearDown()
+
+    def test_version(self):
+        """
+        Verify that the kmip module has a __version__ attribute and that it's
+        value is correct.
+        """
+        kmip = __import__('kmip')
+        self.assertTrue(hasattr(kmip, '__version__'))
+
+        version = __import__('kmip.version')
+        self.assertTrue(hasattr(version, '__version__'))
+
+        observed = getattr(kmip, '__version__')
+        expected = getattr(version, '__version__')
+        self.assertEqual(expected, observed)