[all] added requirements file to replace external_deps
[all] added nose configuration file.nose.cfg
[all] modified tests to use environemnt unittest class to pass with nose runner
[client/setup.py] added AUTOTEST_CONF_PATH for test environments without /etc access
[client/setup.py] added AUTOTEST_TOP_PATH for test environments without /etc access
Merge pull request #1 from niedbalski/nosetests

Added Tox and nosetests runner