[Digital Ocean] Support for multi master KOPS cluster

[srikiz]

1. Currently Digital Ocean supports a single master only. Update KOPS to support multi master nodes for Digital Ocean..

2. Update etcdManager repository to support multiple masters.

Implementation Note - Need to use common tags for volumes and droplets so each master droplet can be attached to the right volume.
Digital Ocean's godo library now has support to tag volumes and this feature can be utilized.

[srikiz]

/assign @srikiz

[srikiz]

Godo library updates was part of the PR - #7467 and is now merged.

[srikiz]

Common tags for volumes and droplets is part the PR - #7566

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[srikiz]

/remove-lifecycle stale

[srikiz]

There is one pending activity on adding a load balancer to balance across multiple masters. A PR should be raised soon.

[srikiz]

Multi-master HA support changes to add load balancer is merged. Closing this issue.