[Zun] Add kuryr-libnetwork to zunclient job
Kuryr-libnetwork was added to $PROJECTS in server job, this commit
added it to client job as well.
export PROJECTS="openstack/zun $PROJECTS"
export PROJECTS="openstack/python-zunclient $PROJECTS"
+ export PROJECTS="openstack/kuryr-libnetwork $PROJECTS"
export DEVSTACK_LOCAL_CONFIG="enable_plugin zun git://git.openstack.org/openstack/zun"
# Keep localrc to be able to set some vars in post_test_hook
