Fix bugs, Update for EL8

tasks/install_server.yml

@@ -100,12 +100,15 @@
 #    - kubernetes_master|bigip_pool
 
 - name: Check if a node is still tainted
-  command: kubectl get nodes '{{ ansible_hostname | lower }}' -o jsonpath='{.spec.taints}'
-  when: kubernetes_master_taint
+  command: kubectl --kubeconfig=/etc/kubernetes/admin.conf get nodes '{{ ansible_hostname | lower }}' -o jsonpath='{.spec.taints}'
   register: current_taint
+  when:
+    - kubernetes_master_taint|bool
 
 - name: taint the machine if needed
 #  command: kubectl --kubeconfig=/etc/kubernetes/admin.conf taint nodes --all node-role.kubernetes.io/master-
   command: kubectl taint nodes '{{ ansible_hostname | lower }}' node-role.kubernetes.io/master-
-  when: kubernetes_master_taint|bool and current_taint.stdout
+  when:
+    - kubernetes_master_taint|bool
+    - current_taint.stdout