tools: hv: Fix how ifcfg-* file is created

Fix for the daemon code and for hv_set_ifconfig.sh script, so
that the created ifcfg-* file is consistent with initscripts
documentation.

Signed-off-by: Tomas Hozza <thozza@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>