List system dependencies for running common tests

Add an other-requirements.txt file containing a cross-platform list
of dependencies needed for running included tox-based tests. Also
include a tox environment for convenience calling the bindep[*]
utility to list any missing system requirements.

This change is self-testing.

For other-requirements.txt see also
http://docs.openstack.org/infra/manual/drivers.html#package-requirements

[*] http://docs.openstack.org/infra/bindep/

Change-Id: I3fa07db6a01a045308fbdc517a695f7be2e88014

other-requirements.txt

@@ -0,0 +1,16 @@
+# This is a cross-platform list tracking distribution packages needed by tests;
+# see http://docs.openstack.org/infra/bindep/ for additional information.
+
+dbus-devel [platform:rpm]
+dbus-glib-devel [platform:rpm]
+language-pack-en [platform:ubuntu]
+locales [platform:debian]
+python-dev [platform:dpkg]
+python-devel [platform:rpm]
+python-libvirt [platform:dpkg]
+python3-all-dev [platform:ubuntu !platform:ubuntu-precise]
+python3-dev [platform:dpkg]
+python3-devel [platform:fedora]
+python3.4 [platform:ubuntu-trusty]
+python34-devel [platform:centos]
+python3.5 [platform:ubuntu-xenial]

tox.ini

@@ -41,3 +41,11 @@ exclude=.venv,.git,.tox,dist,doc,*openstack/common*,*lib/python*,*egg,build
 
 [testenv:docs]
 commands = python setup.py build_sphinx
+
+[testenv:bindep]
+# Do not install any requirements. We want this to be fast and work even if
+# system dependencies are missing, since it's used to tell you what system
+# dependencies are missing! This also means that bindep must be installed
+# separately, outside of the requirements files.
+deps = bindep
+commands = bindep test