tests: do not run node_exporter test on clients
tests: do not run node_exporter test on clients

We need to skip these tests on client nodes since we don't deploy
node_exporter on them anymore

Signed-off-by: Guillaume Abrioux <30a9df5a0293a6108675377fa1673f7aa713f915@redhat.com>

ceph/ceph-ansible,ceph/ceph-ansible