Added feature to get encrypt key from Vault

[Dmitry-Eremeev]

To use the feature we need to set the following options in config file: use_vault = true vault_address = http://<IP_ADDRESS:<IP_PORT> vault_role_id = <ROLE_ID> vault_secret_id = <SECRET_ID> vault_secret_path = <deployments/unit/dev/user/passwords_yml> vault_secret_mount_path = <secret_v2> credential_name_in_vault_secret = <consul_encrypt>

https://github.com/hashicorp/consul/issues/2209 https://github.com/hashicorp/consul/issues/4685 https://github.com/hashicorp/consul/issues/5043

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