Consul kvdb doesn't respect protocol scheme

[mattlqx]

When this is set in the config.json:

    "kvdb": [
        "consul:https://mycluster"
    ],

It still appears to use http to connect to the host. I'm guessing because it appears hardcoded here: https://github.com/portworx/kvdb/blob/master/consul/kv_consul.go#L123

It would be highly desirable to support encryption to the KV store.

[sangleganesh]

Thanks for reporting the issue, will try to fix it.