SAR-359 Updated the dish lmc instance deployment to be configurable

Using the dsh_lmc_server_instances in the values.yaml file, we can now specify the number of dsh-lmc instances we want to deploy on the k8s cluster. The values in the list just represent the name of the device server instance(s). So the length of the list determines how many instances will be deployed (as a set of dish lmc devices).

Made use of the templating to ensure that we can iterate through the number of instances provided for each server. That way we no longer have to hardcode the device server instances in the config yaml files.