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/

Also, merge Xenial followup change into this.

Change-Id: Ifa3d417d9c3f8c172980a593c0a5a4a29987366a
(cherry picked from commit f74d9e3d82)
(cherry picked from commit 5dc965e268)

other-requirements.txt

@@ -0,0 +1,27 @@
+# This is a cross-platform list tracking distribution packages needed by tests;
+# see http://docs.openstack.org/infra/bindep/ for additional information.
+
+gettext
+libssl-dev
+
+dbus-devel [platform:rpm]
+dbus-glib-devel [platform:rpm]
+libdbus-1-dev [platform:dpkg]
+libdbus-glib-1-dev [platform:dpkg]
+libffi-dev [platform:dpkg]
+libffi-devel [platform:rpm]
+libldap2-dev [platform:dpkg]
+libsasl2-dev [platform:dpkg]
+libxml2-dev [platform:dpkg]
+libxslt1-dev [platform:dpkg]
+python-dev [platform:dpkg]
+python3-all-dev [platform:ubuntu !platform:ubuntu-precise]
+python3-dev [platform:dpkg]
+python3.4 [platform:ubuntu-trusty]
+python3.5 [platform:ubuntu-xenial]
+
+cyrus-sasl-devel [platform:rpm]
+libxml2-devel [platform:rpm]
+python-devel [platform:rpm]
+python3-devel [platform:fedora]
+python34-devel [platform:centos]

tox.ini

@@ -72,3 +72,11 @@ commands = sphinx-build -a -E -W -d releasenotes/build/doctrees -b html releasen
 import_exceptions =
     keystoneclient.i18n
 local-check-factory = keystoneclient.tests.hacking.checks.factory
+
+[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