Removed call to disable-iptables script to bring things inline with CentOS 2.6.0. Part of work for IMAGE-452
Removed call to disable-iptables script to bring things inline with
CentOS 2.6.0. Part of work for IMAGE-452

joyent/sdc-vmtools,joyent/sdc-vmtools-lx-brand,rcj4747/sdc-vmtools-lx-brand