Added tox.ini files to subprojects

It is much more convenient to use tox for
managing virtual environments.

Change-Id: Ic4c82fc68b3a0a7fa92fc301b78f6139b28b818b
Closes-Bug: 1321904

requirements.txt

@@ -0,0 +1,6 @@
+netaddr>=0.7.5
+OrderedDict>=1.1
+PyYAML>=3.10
+netifaces>=0.5
+git+https://git.fedorahosted.org/cgit/python-ethtool.git
+urwid>=1.1.1

test-requirements.txt

@@ -0,0 +1 @@
+hacking==0.7

tox.ini

@@ -0,0 +1,37 @@
+[tox]
+minversion = 1.6
+skipsdist = True
+envlist = py26,py27,pep8
+
+[testenv]
+usedevelop = True
+install_command = pip install --allow-external -U {opts} {packages}
+setenv = VIRTUAL_ENV={envdir}
+deps = -r{toxinidir}/requirements.txt
+       -r{toxinidir}/test-requirements.txt
+commands =
+
+[tox:jenkins]
+downloadcache = ~/cache/pip
+
+[testenv:pep8]
+usedevelop = False
+commands =
+    flake8 {posargs:.}
+
+[testenv:venv]
+commands = {posargs:}
+
+[testenv:devenv]
+envdir = devenv
+usedevelop = True
+
+[flake8]
+ignore = H234,H302,H802
+exclude = .venv,.git,.tox,dist,doc,*lib/python*,*egg,build,tools,__init__.py,docs
+show-pep8 = True
+show-source = True
+count = True
+
+[hacking]
+import_exceptions = testtools.matchers