Fix 2280: Random IP's are geeting assigned for Dual stack NS when doing scaling-out/in operation

https://osm.etsi.org/bugzilla/show_bug.cgi?id=2280



Change-Id: Ic190de376e975e31840217cdbf6548863dfe5a02
Signed-off-by: rahul <rahul.k4@tataelxsi.co.in>
(cherry picked from commit 72d90d92)