The REST API should return fully up-to-date information; it should return exactly the same information as is available on the web UI.
Specific examples:
 * /rest/builds/<id>
  - currently does not return the "masterNodeAddress" for "RUNNING" builds
 * /rest/builds?<query>
  - currently returns stale data for the "version" for "RUNNING" builds
  - currently does not return the "masterNodeAddress" for "RUNNING" builds
My application needs a trustworthy, up-to-date source of information for "RUNNING" builds.
This is an extension of 
https://track.pmease.com/browse/QB-3675