Change methods to call openstack utils
Change methods to call openstack utils

Change-Id: I3ac1fba007ae91dc8963139caa0d6ac2a48d2ba8
Signed-off-by: wuwenbin2 <9b168c28d1a722cb96104deb3b079d58fdb1aa4a@huawei.com>

opnfv/functest,mywulin/functest,opnfv/functest,mywulin/functest