tests: fix variable name
tests: fix variable name

Change-Id: Ie3c3b4d4cd871fa9b03225a193b439e1cfc18674
Signed-off-by: Julien Danjou <5c682c2d1ec4073e277f9ba9f4bdf07e5794dabe@danjou.info>

citrix-openstack-build/tooz,openstack/tooz,openstack/tooz,citrix-openstack-build/tooz