os-brick: Add bindep support

This patch adds support for the bindep python package.  This enables os-brick
to specify binary package requirements for operations.

Change-Id: Iab5e923101855622c33df85899401c48a668ee15

bindep.txt

@@ -0,0 +1,7 @@
+# This is a cross-platform list tracking distribution packages needed for
+# install and tests
+# see http://docs.openstack.org/infra/bindep/ for additional information.
+
+multipath-utils [platform:dpkg rpm]
+sg3-utils [platform:dpkg]
+sg3_utils [platform:rpm]

tox.ini

@@ -81,3 +81,14 @@ max-complexity=30
 
 [hacking]
 import_exceptions = os_brick.i18n
+
+[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