Both V2 and V3 API do not support service request parameter filter
for os-hosts request. For V2 API, there is no need to having two
different clouds having different APIs (one with service filter
one without) but just take V2 API as a document bug. This patch
will only fix V3 API.
DocImpact
Adds the ability to filter a hosts list request by service for
the V3 API.
Change-Id: I42163707049300b0dee677558ed49280bcc7369d
Partial-Bug: #1224763
67c0d16eb6