Reorganizing test suite and updating tox configuration

This change reorganizes the test suite, splitting it into two separate
test suites, one for unit tests and one for integration tests. The tox
configuration is also updated to reflect this change. Invoking tox now
runs the unit tests by default. A separate tox environment is used to
run the integration tests.

setup.py

@@ -25,7 +25,7 @@ setuptools.setup(
     url='https://github.com/OpenKMIP/PyKMIP',
     license='Apache License, Version 2.0',
     packages=setuptools.find_packages(exclude=["kmip.tests", "kmip.tests.*"]),
-    package_data={'kmip': ['logconfig.ini'],
+    package_data={'kmip': ['kmipconfig.ini', 'logconfig.ini'],
                   'kmip.demos': ['certs/server.crt', 'certs/server.key']},
     install_requires=[
         "enum34",