Use 'import ... from ...' where applicable
Empty rejviz-install command
Fetching NIC configs from images

rejviz-install can now fetch and log NIC configs from images.
Virt-install uses --disk instead of -a or -d

Rejviz-install must work with that syntax too. We'll still keep the
old domain/image args extraction helper for implementing
rejviz-customize.
Functions for getting network info from libvirt
Process NIC mappings on the command line

Rejviz's --nic-mappings and --auto-nic-mappings arguments get replaced
for virt-install's --network arguments.
Support adding gateway to ifcfg-eth
Support for DNS1 and DNS2 in ifcfg-eth