add tox-related stuff

.testr.conf

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+[DEFAULT]
+test_command=OS_STDOUT_CAPTURE=1 OS_STDERR_CAPTURE=1 ${PYTHON:-python} -m subunit.run discover -t ./ ./tests/unit $LISTOPT $IDOPTION
+test_id_option=--load-list $IDFILE
+test_list_option=--list

requirements.txt

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+pbr
+oslo.db
+python-novaclient

test-requirements.txt

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+# The order of packages is significant, because pip processes them in the order
+# of appearance. Changing the order has an impact on the overall integration
+# process, which may cause wedges in the gate later.
+hacking<0.10,>=0.9.2
+
+coverage>=3.6
+ddt>=0.7.0
+mock>=1.2
+testrepository>=0.0.18
+testtools>=1.4.0
+
+oslosphinx>=2.5.0 # Apache-2.0
+oslotest>=1.10.0 # Apache-2.0

tox.ini

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+[tox]
+minversion = 1.6
+skipsdist = True
+envlist = py26,py27,py33,py34,pep8
+
+[testenv]
+setenv = VIRTUAL_ENV={envdir}
+         LANG=en_US.UTF-8
+         LANGUAGE=en_US:en
+         LC_ALL=C
+         PYTHONHASHSEED=0
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+install_command = pip install -U {opts} {packages}
+usedevelop = True
+commands =
+  /usr/bin/find . -type f -name "*.pyc" -delete
+  python setup.py testr --slowest --testr-args='{posargs}'
+distribute = false
+basepython = python2.7
+
+[testenv:pep8]
+commands = flake8
+distribute = false
+
+[testenv:py26]
+basepython = python2.6
+
+
+[testenv:py34]
+basepython = python3.4
+
+
+[testenv:venv]
+commands = {posargs}
+
+[testenv:cli]
+sitepackages = True
+commands = {toxinidir}/tests/ci/rally-integrated.sh
+
+[testenv:cover]
+commands = {toxinidir}/tests/ci/cover.sh {posargs}
+
+
+[testenv:docs]
+changedir = doc/source
+commands = make html
+
+[testenv:genconfig]
+commands =
+    oslo-config-generator --config-file etc/rally/rally-config-generator.conf
+
+[tox:jenkins]
+downloadcache = ~/cache/pip
+
+[flake8]
+ignore = H703
+show-source = true
+exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,tools,build,setup.py
+
+[hacking]
+import_exceptions = rally.common.i18n
+local-check-factory = tests.hacking.checks.factory