Merge "Don't install zuul in the bindep tox testenv"

tox.ini

@@ -42,6 +42,7 @@ commands =
 # 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.
+usedevelop = False
 install_command = pip install {opts} {packages}
 deps = bindep
 commands = bindep test