2 Fix for Nine: DATA APi buildSlave - configured_on and connected_to

The commit 16586c85f046b62bf04edb4d6a841ec91fca811a fix the following issue:
 - When a slave disconnects, the DATA API isn't aware of the event.

The commit a53c4bc7b40538c5fbf063b4e02b0a36f2f83e5b fix the following issue: 
 - BuildSlave DATA API: "configured_on" is always an empty list