Remove angular plugins from grafana

Author: technowhizz

etc/kayobe/kolla.yml

@@ -410,7 +410,6 @@ kolla_build_customizations_common:
     - "/glance"
     - "glance_store[cinder,vmware,swift,s3]@git+https://github.com/stackhpc/glance_store@stackhpc/4.7.0.6"
   grafana_plugins_append:
-    - grafana-piechart-panel
     - vonage-status-panel
   ironic_inspector_pip_packages_append:
     - /additions/*