Py3: Don't use dict.values()[0]
Py3: Don't use dict.values()[0]

In Py3 'dict_values', 'dict_keys', 'dict_items' objects don't support
indexing.

Change-Id: Ie29ac8c38aa2e72f73f9b4d04ff187d214b0df34

openstack/octavia,openstack/octavia,openstack/octavia