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: I8c581225eada929bc947b13f851bb228000f32fe

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

@@ -112,6 +112,17 @@ commands = bandit -r cinder -n5 -x tests -ll
 envdir = {toxworkdir}/bandit
 commands = bandit-baseline -r cinder -n5 -x tests -ii -ll
 
+[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]
 # Following checks are ignored on purpose.
 #