I can confirm that having the CentOS 7 AMI image deployed needs this to work fine :

#
#
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/sysconfig/selinux
sed -i 's/\(^SELINUX=\).*/\SELINUX=disabled/' /etc/selinux/config
sed -i 's/IPV6_AUTOCONF=no/IPV6_AUTOCONF=yes/' /usr/lib/python2.7/site-packages/cloudinit/net/sysconfig.py