Remove unnecessary setUp
Remove unnecessary setUp

setUp will be automatically called around each
testcase, so this is to remove setUp that doing
nothing additional than super to keep code clean.

Change-Id: I47be2be6f0e9785eb166f89d411582d6292babc1

dtroyer/python-openstackclient,dtroyer/python-openstackclient,openstack/python-openstackclient,openstack/python-openstackclient