Add template override for grafana plugins

[Arnaud PARENT]

Currently, we cannot customize grafana plugins installation which cause issue during grafana container build when you don't have access to internet.

in docker/grafana/Dockerfile.j2:

RUN grafana-cli plugins install gnocchixyz-gnocchi-datasource \
    && grafana-cli plugins install grafana-influxdb-08-datasource \
    && chmod 750 /etc/sudoers.d/ \
    && chmod 440 /etc/sudoers.d/kolla_grafana_sudoers \
    && chmod 755 /usr/local/bin/kolla_extend_start

I suggest to add a template override block to customize the installation using template override feature.

[Mark Goddard (mgoddard)]

Seems like a good idea. Please propose a patch.

[Mark Goddard (mgoddard)]

https://review.opendev.org/#/c/656502

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/656502
Committed: https://git.openstack.org/cgit/openstack/kolla/commit/?id=a873677392f1736a73726d3f25a01c2f7cb1ade9
Submitter: Zuul
Branch: master

commit a873677392f1736a73726d3f25a01c2f7cb1ade9
Author: Arnaud PARENT <email address hidden>
Date: Tue Apr 30 11:31:50 2019 +0000

    Add template override for grafana plugins

    Change-Id: I209c3c60d5c2edb6856e81eb374fbcad648e3904
    Closes-Bug: #1827025

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/kolla 9.0.0.0rc1 release candidate.