### Motivation
Allow Grafana to be served from a sub path.
### Modifications
- Added a config map to add extra environment variables to the grafana deployment. As the grafana image adds new features that require environment variables, this can be used to set them.
- Bumped the grafana image to allow a reverse proxy
- removed ingress annotations as they are specific to nginx, and to match all the other ingresses
- bumped the chart version as per the README
Example values:
```
grafana:
configData:
GRAFANA_ROOT_URL: /pulsar/grafana
GRAFANA_SERVE_FROM_SUB_PATH: "true"
ingress:
enabled: true
port: 3000
path: "/pulsar/grafana/?(.*)"
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /$1
```
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