oep(ndm): proposal for unique disk identification (openebs#2666)

* added workflow chart
* added WWN to flowchart
* added partition also into the workflow
* added 2 points in drawbacks section
* Added new configuration options for UID generation
* added QEMU_HARDDISK to list of models
* updates OEP with latest changes and implementation details

Signed-off-by: Akhil Mohan <akhil.mohan@mayadata.io>

doc(upgrade): add upgrade and migration docs. (openebs#3103)

* add ndm related notes.
* move upgrades up to 1.12.0 to separate dir

Signed-off-by: Akhil Mohan <akhil.mohan@mayadata.io>
Co-authored-by: shubham <shubham.bajpai@mayadata.io>

feat(governance): add new contributors to OpenEBS

Refer: [GOVERNANCE.md](https://github.com/openebs/openebs/blob/master/GOVERNANCE.md).

The following community members have been helping with enhancing and testing
of several areas of the OpenEBS project that broadly fall in the purview of the
control plane.

Based on their past contributions and their interest/commitment to contributing
to OpenEBS, we take pride in adding them as reviewers to the OpenEBS project.

The list of community members in alphabetical order are:

- Mehran Kholdi for the contributions to the Local PV and control plane in general.
  ```
  - openebs#2975
  - 40+ commits in https://github.com/openebs/rawfile-localpv
  ```

- Michael Fornaro for the contributions to the ARM, Multi-arch builds and helm charts that fall under control plane.
  ```
  - openebs-archive/e2e-tests#405
  - openebs#3038
  - openebs#3023
  - openebs#3037
  - openebs#1295
  - openebs/linux-utils#5
  - openebs-archive/node-disk-manager#446
  - openebs-archive/node-disk-manager#449
  - openebs-archive/node-disk-manager#428
  ```

- Peeyush Gupta for the contributions to the Power builds and control plane in general.
  ```
  - openebs/charts#127
  - openebs-archive/node-disk-manager#448
  - openebs-archive/maya#1632
  - openebs-archive/jiva#279
  - openebs-archive/maya#667
  - openebs-archive/istgt#131
  - openebs-archive/maya#561
  - openebs-archive/maya#750
  ```

Signed-off-by: kmova <kiran.mova@mayadata.io>

chore(upgrade): update upgrade README with 1.11.0 steps (openebs#3058)

* chore(upgrade): update upgrade README with 1.11.0 steps
* made upgrade matrix more concise

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

chore(upgrade): update upgrade README with 1.10.0 steps

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

chore(upgrade): update upgrade README with 1.9.0 steps (openebs#2996)

update examples with 1.9.0 tags
update examples with option to use multiple volume upgrades. 

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

refact(README): update upgrade README with 1.8.0 steps

This PR adds steps for 1.8.0 upgrade.

Signed-off-by: shubham <shubham.bajpai@mayadata.io>

refact(README): update upgrade README with 1.7.0 steps (openebs#2914)


Signed-off-by: Akhil Mohan <akhil.mohan@mayadata.io>

chore(helm): update to 1.6 release (openebs#2886)

 - Updated images tag as per 1.6.0-RC2 release
 - Updated values.yaml
 - Updated README
 - Updated  clusterrole.yaml

Also, merge the changes from upstream helm. 

Signed-off-by: ChandanSagar <chandan.pradhan@mayadata.io>

[WIP] refactor(install): Updated local helm chart for 1.5.0 release

 - Updated local helm chart for 1.5.0 release.

Signed-off-by: ChandanSagar <chandan.pradhan@mayadata.io>