Include datastore version details in datastore calls

Currently it takes n+1 API calls to obtain the versions for each
datastore. This blueprint augments the response to add
the version details.

Implements: blueprint list-datastore-type-and-versions

Change-Id: I2fc2da8109d23038909f5f604cabf209e2eb1d11
Merge "Include datastore version details in datastore calls"