Update openshift-client.yaml with optional results field

Added a results field with an optional RESULT to emit output for use in pipeline or next tasks.
The default value is set to an empty string according to TEP-0048: Task Results without Results.

task/openshift-client/0.2/openshift-client.yaml

@@ -38,6 +38,12 @@ spec:
       description: The OpenShift Version to use
       type: string
       default: "4.7"
+
+  results:
+    - name: RESULT
+      description: Can be used to store output in order to be used by following tasks (with tasks.taskname.results.RESULT). Default value is empty string
+      type: string
+
   steps:
     - name: oc
       image: quay.io/openshift/origin-cli:$(params.VERSION)
@@ -50,5 +56,7 @@ spec:
         [[ "$(workspaces.kubeconfig-dir.bound)" == "true" ]] && \
         [[ -f $(workspaces.kubeconfig-dir.path)/kubeconfig ]] && \
         export KUBECONFIG=$(workspaces.kubeconfig-dir.path)/kubeconfig
-
+        
+        echo "" > $(results.RESULT.path)
+        
         $(params.SCRIPT)