Controller's "preupgrade" handler replaces
deployment_info if "isolated". After that
Octane applies network template.
But nailgun will NOT apply any new settings
if replaced_deployment_info exists for node.
Closes-bug: 1572240
Change-Id: I06922a59a5f6976acb7c268460fb95fcde86aa54
(cherry picked from commit 62f75c1044)