hardcode eth0 to 192.168.124.10

This eliminates the dependency on Vagrant or other external
DHCP, so it can work as a bare metal appliance too.
remove eth1 config

Vagrant can configure eth1 itself, and in the bare metal
case, according to Cameron this breaks single-NIC setups.
don't assume we have a vagrant user
remove comments from sles11-sp3's ifcfg-eth0

This way we can actually see the config at a glance.
zypper rm atftp
remove tmp/.gitkeep
reduce tcpdump to 1 second
eliminate repeated references to /tmp

This will let us duplicate the functionality of this file in the
non-Vagrant appliance by copying the code and minimising the
differences for ease of future maintenance.
install easy_diff gem via provision-root-files.sh

This will let us duplicate the functionality of this file in the
non-Vagrant appliance by copying the code and minimising the
differences for ease of future maintenance.
move copy to /etc of network.json, to provision-root-files.sh
add a default gateway of 192.168.124.1
add network config for basic network settings

This prepopulates network settings in YaST2 firstboot.
give do-crowbar_register.sh a better name