Split requirements.txt per test.

* Update gunicorn, SQLAlchemy and Python 2.7.8
* Use pid instead of search and kill
* Move config/uwsgi.ini and config/nginx_uwsgi.conf to each test directory.
* Use apt-get -q
Fix typo
Merge pull request #984 from methane/python-pertest-requirements

Python: Split requirements.txt per test
Merge branch 'master' into toolset-fix-448