Remove istio support

Use helm install or support in future

roles/kubernetes/preinstall/tasks/growpart-azure-centos-7.yml

@@ -12,7 +12,7 @@
   failed_when: False
   changed_when: "'NOCHANGE:' not in growpart_needed.stdout"
   register: growpart_needed
-  environment: 
+  environment:
     LC_ALL: C
 
 - name: check fs type
@@ -23,7 +23,7 @@
 - name: run growpart
   command: growpart /dev/sda 1
   when: growpart_needed.changed
-  environment: 
+  environment:
     LC_ALL: C
 
 - name: run xfs_growfs