test/cmd/idle: don't delete the service during the test

oc/idle will now additionally annotate the service. The test
explicitly deletes it so removing that call so that we can verify the
following PRs, all related to annotating the service when idling.

- openshift/oc#720
- openshift/router#225
- openshift/sdn#252
- openshift/openshift-apiserver#180
- openshift/openshift-controller-manager#165

test/extended/testdata/cmd/test/cmd/idle.sh

@@ -28,7 +28,6 @@ setup_idling_resources() {
     os::cmd::try_until_success 'oc describe endpoints idling-echo'
     local endpoints_json
     endpoints_json="$(oc get endpoints idling-echo -o json)"
-    os::cmd::expect_success 'oc delete service idling-echo'
     os::cmd::expect_success "echo '${endpoints_json}' | oc create -f -"
     os::cmd::expect_success 'oc describe endpoints idling-echo'
     # deployer pod won't work, so just scale up the rc ourselves