Sentry DNS update

We have finished the implementation of the DNS Sentry nodes for Nodes discovery.

This will allow the Cosmos Validator to update it's list of sentry automatically without manual intervention.

The Load Balancers internal DNS gets registered and the validator can query its value updating it's peers/seeds if it detects any changes on elb or sentry nodes.

This will allow the update/upgrade of sentry nodes with 0 downtime and will also allow self healing of sentry nodes in case of failure since health checks have been implemented.

More updates regarding the VPN and Cosmos Validator coming soon...

Miguel Torres