Add bindep.txt file

Bindep is a tool for checking the presence of binary packages needed
to use an application / library. It started life as a way to make it
easier to set up a development environment for OpenStack projects.

Change-Id: Id58d5e1ff4a2a9a2ace474cf3f4ed949737ec823
Signed-off-by: Paul Belanger <pabelanger@redhat.com>

bindep.txt

@@ -0,0 +1,2 @@
+# This is a cross-platform list tracking distribution packages needed by tests;
+# see http://docs.openstack.org/infra/bindep/ for additional information.

tox.ini

@@ -34,3 +34,13 @@ show-source = True
 ignore = E123,E125
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
+
+# This environment can be used to quickly validate that all needed system
+# packages required to successfully execute test targets are installed
+[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