fix ansible to use configured kubernetes_context (#1050)

Author: abrightwell

ansible/roles/pgo-metrics/tasks/kubernetes_auth.yml

@@ -1,4 +1,4 @@
 ---
 - name: Set the Kubernetes Context
-  shell: "kubectl config set-context {{ kubernetes_context }}"
+  shell: "kubectl config use-context {{ kubernetes_context }}"
   tags: always

ansible/roles/pgo-operator/tasks/kubernetes_auth.yml

@@ -1,4 +1,4 @@
 ---
 - name: Set the Kubernetes Context
-  shell: "kubectl config set-context {{ kubernetes_context }}"
+  shell: "kubectl config use-context {{ kubernetes_context }}"
   tags: always