Protect cinderclient import
Protect cinderclient import

Importing cinderclient breaks logging setups. Luckily, we only need it
in one function, so late-import it.

Change-Id: I86f090e8f3bbd3ac57e221df6629c6e008c99aa8

openstack/python-openstacksdk,dtroyer/python-openstacksdk,stackforge/python-openstacksdk,openstack-infra/shade,dtroyer/python-openstacksdk,openstack-infra/shade,stackforge/python-openstacksdk,openstack/python-openstacksdk