network:ibft put IPv6 IP in brackets

ip=2620:0052:0000:2220:0226:b9ff:fe81:cde4::[2620:0052:0000:2220:0000:0000:0000:03fe]:64::ibft0:none

should be

ip=[2620:0052:0000:2220:0226:b9ff:fe81:cde4]::[2620:0052:0000:2220:0000:0000:0000:03fe]:64::ibft0:none

https://bugzilla.redhat.com/show_bug.cgi?id=1322592#c19
(cherry picked from commit b8e6c051c6)

modules.d/40network/net-lib.sh

@@ -284,6 +284,7 @@ ibft_to_cmdline() {
                 [ -e ${iface}/hostname ] && hostname=$(read a < ${iface}/hostname; echo $a)
                 if [ "$family" = "ipv6" ] ; then
                     if [ -n "$ip" ] ; then
+                        ip="[$ip]"
                         [ -n "$prefix" ] || prefix=64
                         ip="[${ip}/${prefix}]"
                         mask=