Add attributes to configure Consul ports
Merge pull request #26 from jubianchi/consul-ports

Add attributes to configure Consul ports
cleanup style of previous commit
Add TLS support

- Add the missing bootstrap_expect param
- Add the missing encrypt param
- Add encrypt_enabled param to make gossip encryption explict
Add missing databag documentation
Derive certs path from config_dir

More on that: https://coderanger.net/derived-attributes/