oc get nodes with selector should be separated by commas

[e-minguez]

cnf-features-deploy/hack/setup-test-cluster.sh

Lines 11 to 12 in ef3c35c

	nodes=$(${OC_TOOL} get nodes --selector='node-role.kubernetes.io/worker' \
	--selector='!node-role.kubernetes.io/master' -o name | sed -n 1,2p)

-l, --selector='': Selector (label query) to filter on, supports '=', '==', and '!='.(e.g. -l key1=value1,key2=value2)

Otherwise, it uses just the latest selector:

[kni@kni1-bootstrap cnv]$ oc get nodes
NAME                                         STATUS   ROLES               AGE   VERSION
kni1-master-0.cloud.lab.eng.bos.redhat.com   Ready    worker,worker-cnf   26h   v1.17.1
kni1-master-1.cloud.lab.eng.bos.redhat.com   Ready    worker,worker-cnf   26h   v1.17.1
kni1-vmaster-0                               Ready    master              27h   v1.17.1
kni1-vmaster-1                               Ready    master              27h   v1.17.1
kni1-vmaster-2                               Ready    master              27h   v1.17.1
kni1-worker-0.cloud.lab.eng.bos.redhat.com   Ready    worker              27h   v1.17.1

$ oc get nodes --selector='node-role.kubernetes.io/worker' --selector='!node-role.kubernetes.io/worker-cnf'
NAME                                         STATUS   ROLES    AGE   VERSION
kni1-vmaster-0                               Ready    master   27h   v1.17.1
kni1-vmaster-1                               Ready    master   27h   v1.17.1
kni1-vmaster-2                               Ready    master   27h   v1.17.1
kni1-worker-0.cloud.lab.eng.bos.redhat.com   Ready    worker   27h   v1.17.1

vs

$ oc get nodes --selector='node-role.kubernetes.io/worker,!node-role.kubernetes.io/worker-cnf'
NAME                                         STATUS   ROLES    AGE   VERSION
kni1-worker-0.cloud.lab.eng.bos.redhat.com   Ready    worker   27h   v1.17.1