Add a local bindep.txt override

This avoids falling back to the global bindep-fallback.txt which
installs a pretty big environment. Without this change, a lot
of additional but unnecessary packages are installed on the nodepool
workers.

Change-Id: Id6c17f9a53ad8ad5f0bb9d308ccf5d33a6f59f7f

bindep.txt

@@ -0,0 +1,22 @@
+# This is a cross-platform list tracking distribution packages needed for install and tests;                                                            # see http://docs.openstack.org/infra/bindep/ for additional information.
+
+build-essential [platform:dpkg test]
+gcc [platform:rpm test]
+gettext [!platform:suse]
+gettext-runtime [platform:suse]
+libffi-dev [platform:dpkg]
+libffi-devel [platform:redhat]
+libffi48-devel [platform:suse]
+virtual/libffi [platform:gentoo]
+locales [platform:debian]
+mariadb [platform:rpm]
+mariadb-server [platform:redhat]
+mariadb-devel [platform:redhat]
+libmysqlclient-dev [platform:dpkg]
+libmysqlclient-devel [platform:suse]
+mysql-client [platform:dpkg]
+mysql-server [platform:dpkg]
+postgresql
+postgresql-client [platform:dpkg]
+postgresql-devel [platform:rpm]
+postgresql-server [platform:rpm]

tox.ini

@@ -99,6 +99,17 @@ commands =
   rm -rf api-ref/build
   sphinx-build -W -b html -d api-ref/build/doctrees api-ref/source api-ref/build/html
 
+[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, and develop mode disabled
+# explicitly to avoid unnecessarily installing the checked-out repo too (this
+# further relies on "tox.skipsdist = True" above).
+deps = bindep
+commands = bindep test
+usedevelop = False
+
 [flake8]
 # TODO(dmllr): Analyze or fix the warnings blacklisted below
 # E711  comparison to None should be 'if cond is not None:'