* [openebs] update charts to latest 0.8.1 release (#11650)

  - Updated README
  - Updated chart version
  - Updated values.yaml
  - Updated questions.yaml
  - Added liveness probe in all control-plane component templates
  - Change NDM update strategy to 'RollingUpdate'
  - Update NDM image to 0.3.1
Signed-off-by: prateekpandey14 <prateekpandey14@gmail.com>

Also update K8S version requirement to accept k3s as a valid version

* bump istio chart to v1.0.5

* backup istio v1.0.1 chart

* Update maya-apiserver labels
* Update chart version in Charts.yaml
Signed-off-by: prateekpandey14 <prateekpandey14@gmail.com>

* Add missing annotations for statefulset implementation

* Chart version bump to v0.2.0

Longhorn v0.3.3

* moved latest to v0.7.12

* adding v0.8.3 to latest

1. bump drone chart to version 1.7.4
2. added existing PVC claim option and fixed env yaml format issue

* Add OpenEBS v0.8 Chart

OpenEBS 0.8 add support for:
- cStor Storage Engine
- Further enhancements to Jiva Storage Engine
- Ability to send anonymous usage statistics
- More flexible Storage Policy declarations for Storage Engines
  via CAS Templates
- Automated setting up of default storage classes.

This release also removes the bundling of Prometheus and Grafana
and is limited to installing only OpenEBS core components.
Signed-off-by: kmova <kiran.mova@openebs.io>

update drone and bump chart testing