[gentoo][network] check if 'ip' cmd exists before using to flush old config
[gentoo][network] check if 'ip' cmd exists before using to flush old config

joejulian/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix,rackerlabs/openstack-guest-agents-unix,joejulian/openstack-guest-agents-unix