Merge "Deprecated tox -downloadcache option removed"

Author: Jenkins

tox.ini

@@ -27,9 +27,6 @@ commands = python setup.py test --coverage --testr-args='{posargs}'
 [testenv:debug]
 commands = oslo_debug_helper -t openstackclient/tests {posargs}
 
-[tox:jenkins]
-downloadcache = ~/cache/pip
-
 [testenv:docs]
 commands = python setup.py build_sphinx