Deprecate partial field in v1.0, remove in v1.1

As of the Icehouse release, drivers are no longer allowed to enqueue a
subset of the messages submitted by the client; it's all or nothing.
Therefore, 'partial' is now always False in the v1.0 API, and the
field has been completely removed in v1.1.

Change-Id: I97a9e7e0dc047f44c7d6aab8913cdffb04a5b642
Partially-Implements: blueprint api-v1.1-response-document-changes
Merge "Deprecate partial field in v1.0, remove in v1.1"