Implement shortcut 'ip=<ifname>:static' for static configuration

To simplify static configurate we should be pulling in the
existing 'ifcfg' files when running in hostonly mode.
With that we can implement the shortcut 'ip=<ifname>:static'
to use the existing configuration from the ifcfg file.

Signed-off-by: Hannes Reinecke <hare@suse.de>
95iscsi: use static configuration for software iscsi

When using software iscsi we should be using the existing
configuration from the system for the time being.

References: bnc#884768

Signed-off-by: Hannes Reinecke <hare@suse.de>