Update artifact submodule (#2669)
Update artifact submodule (#2669)

Signed-off-by: Kevin Carter <ffb54fded2f22052678e45d78b58d223654eb6fa@rackspace.com>
robb-romans/rpc-openstack,BjoernT/rpc-openstack,mancdaz/rpc-openstack,hughsaunders/rpc-openstack,rcbops/rpc-openstack,robb-romans/rpc-openstack,prometheanfire/rpc-openstack,BjoernT/rpc-openstack,prometheanfire/rpc-openstack,cloudnull/rpc-openstack,cloudnull/rpc-openstack,hughsaunders/rpc-openstack,jacobwagner/rpc-openstack,rcbops/rpc-openstack,mancdaz/rpc-openstack,jacobwagner/rpc-openstack