fix quantum endpoint path

quantumclient appends the API version to the url, which would result in
faulty urls like https://localhost:9696/v2/v2.0/...

Change-Id: I6b0b97db7c02d54b517bff106472c0a8a3fa22c6
Incorrectly mocked search results

Replaced `::Chef::Search::Query` with `search`.  Search only returns
an array of nodes.

Change-Id: I9280a066eb182f1d50bf4f641f9516fd47f7cabf