Following change I1393d65ffb20b1396ff068def237418958ed3289 the ctlplane
network will be 192.168.24 by default and not 192.0.2 anymore.
This change removes old references left to 192.0.2 network from the
overcloud templates.
Change-Id: I1986721d339887741038b6cd050a46171a4d8022