Add support for test execution using tox

.testr.conf

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+[DEFAULT]
+test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
+             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
+             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-60} \
+             ${PYTHON:-python} -m subunit.run discover -t ./ ./unit_tests $LISTOPT $IDOPTION
+
+test_id_option=--load-list $IDFILE
+test_list_option=--list

requirements-precise.txt

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+PyYAML==3.10
+simplejson==2.3.2
+netifaces==0.8
+netaddr==0.7.10
+Jinja2==2.6
+six==1.1.0

requirements-trusty.txt

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+PyYAML==3.10
+simplejson==3.3.1
+netifaces==0.8
+netaddr==0.7.10
+Jinja2==2.7.2
+six==1.5.2

test-requirements-precise.txt

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+testtools==0.9.35
+coverage==3.7.1
+mock==1.0.1
+flake8==2.1.0
+# No version required
+testrepository
+charm-tools

test-requirements-trusty.txt

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+testtools==0.9.35
+coverage==3.7.1
+mock==1.0.1
+flake8==2.1.0
+# No version required
+testrepository
+charm-tools

tox.ini

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+[tox]
+# Default to current LTS
+envlist = lint,py27-trusty
+skipsdist = True
+
+[testenv]
+setenv = VIRTUAL_ENV={envdir}
+         PYTHONHASHSEED=0
+install_command =
+  pip install --allow-unverified python-apt {opts} {packages}
+commands = testr run {posargs}
+
+[testenv:py27-precise]
+basepython = python2.7
+deps = -r{toxinidir}/requirements-precise.txt
+       -r{toxinidir}/test-requirements-precise.txt
+
+[testenv:py27-trusty]
+basepython = python2.7
+deps = -r{toxinidir}/requirements-trusty.txt
+       -r{toxinidir}/test-requirements-trusty.txt
+
+[testenv:lint]
+basepython = python2.7
+deps = -r{toxinidir}/requirements-trusty.txt
+       -r{toxinidir}/test-requirements-trusty.txt
+commands = flake8 {posargs} actions hooks unit_tests tests
+           charm proof
+
+[testenv:venv]
+commands = {posargs}
+
+[flake8]
+ignore = E402,E226
+exclude = hooks/charmhelpers