Nodepool now uses openstacksdk in place of shade. Add a logger
for that.
Also, this makes the builder logging config look like the one in
system-config which is, accidentally, the actual logging config
being used right now. I'm going to put up another change to use
the logging config in this repo, which is the correct thing to do
for v3 of nodepool.
Change-Id: I5e6ab0a34e9e5df0ee152b33b01e5266691e6fc6
fe2f7811f3