Add suport for consul tls

[es-x]

Hello can u add support consul tls as for etcd tls

consul-ca-file
consul-cert-file
consul-key-file

Thanks.

[tpo]

See #54 and also #13

vip-manager with TLS support: https://github.com/tpo/vip-manager

[pashagolub]

PR is welcome!

[github-actions]

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