Regression in the ifcfg files created during kickstart

Issue

• RHEL7.2 populated /etc/sysconfig/network-scripts/ifcfg-* with PREFIX and several IPv6 variables:

TYPE="Ethernet"
BOOTPROTO="none"
IPADDR="192.0.2.2"
PREFIX="24"
GATEWAY="192.0.2.1"
DNS1="192.0.2.1"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_FAILURE_FATAL="no"
IPV6_ADDR_GEN_MODE="stable-privacy"
NAME="eth0"
UUID="00b141e5-cbda-4624-9cf4-ec21ebbf91fe"
DEVICE="eth0"
ONBOOT="yes"

• A kickstarted RHEL 7.3 system has a much leaner ifcfg configuration:

# Generated by parse-kickstart
UUID="8b4753fb-c562-4784-bfa7-f44dc6581e73"
DNS1="192.0.2.1"
IPADDR="102.0.2.2"
GATEWAY="192.0.2.1"
NETMASK="255.255.255.0"
BOOTPROTO="static"
DEVICE="eth0"
ONBOOT="yes"
IPV6INIT="yes"