v3 test utils, don't modify input parameter
v3 test utils, don't modify input parameter

As mentioned in https://review.openstack.org/#/c/61046/ for
test_update, we should not modify the input req_ref in test_create
instead we should make a copy

Change-Id: I649433596a3ebbf2133eb724f09eb4bd470b7cdd

ging/python-keystoneclient,darren-wang/ksc,magic0704/python-keystoneclient,alexpilotti/python-keystoneclient,klmitch/python-keystoneclient,sdpp/python-keystoneclient,jamielennox/python-keystoneclient,Mercador/python-keystoneclient,alexpilotti/python-keystoneclient,metacloud/python-keystoneclient,jamielennox/python-keystoneclient,metacloud/python-keystoneclient,ging/python-keystoneclient,darren-wang/ksc,klmitch/python-keystoneclient,magic0704/python-keystoneclient,Mercador/python-keystoneclient,jamielennox/python-keystoneclient,sdpp/python-keystoneclient