* Bootstrap Nomad ACL system if no token is given
Similar to the [Bootstrap the Consul ACL system if no token is given][boostrap-consul]
it would be very useful to bootstrap Nomads ACL system and manage it in
Vault.
[boostrap-consul]:https://github.com/hashicorp/vault/pull/10751
* Add changelog entry
* Remove debug log line
* Remove redundant else
* Rename Nomad acl bootstrap param
* Replace sleep with attempt to list nomad leader, setup will retry until successful
* fmt
