Add more ut for kuryr/lib/utils.py
Add more ut for kuryr/lib/utils.py

Only have two UT for utils.py now, I add UT for most of the rest
functions in utils.py ,

Change-Id: Ie1c3aeaf02d0a1c2f3fbe3fd6913678afa1618cb

openstack/kuryr,openstack/kuryr,celebdor/kuryr,celebdor/kuryr