add ONBOOT and NM_CONTROLLED to redhat/network_static

Fixes private networking on Centos 6. It seems using Network Manager (NM_CONTROLLED) to change an interface while running (and not reboot) is a bad idea. I'm not sure of any specifics though. This is the only way I could get it to work. Note: I am using a custom packaged box, but this this seems reasonable because it matches the settings of fedora/network_static.