When autoscaling is disabled after pools are created, there is an
opportunity for some autoscaling to take place before autoscaling
is disabled. This change checks to see if autoscaling needs to be
disabled before creating pools, then checks to see if it needs to
be enabled after creating pools. This ensures that autoscaling
won't happen when autoscaler is disabled and autoscaling won't
start prematurely as pools are being created when it is enabled.
Change-Id: I8803b799b51735ecd3a4878d62be45ec50bbbe19
69a7916b92