Console should not read server results from "server-groups" child of response "result" object.

https://community.jboss.org/wiki/FormatOfADetypedOperationResponse describes the "server-groups" data in a domain mode operation response as being a sibling of "outcome" and "result". The HC prior to 7.1.0.Final was reporting it as a child of "result" and not a sibling, and the console was therefore looking for it there. As part of the AS7-2907 fix, the HC will begin reporting it as a sibling as well as a child. For 7.1.1 the console should be adapted to look for it as a sibling, since in 7.1.1 reporting it as child will be removed.