Add output to create command for deletion of exit node

[adamjohnson01]

Description

The create command will not output the delete command for the exit node
that was just created. Related to #2

How Has This Been Tested?

I have tested with all providers except packet.

Using provider: digitalocean
Requesting host: angry-archimedes1 in , from digitalocean
2020/01/03 14:14:44 Provisioning host with DigitalOcean
Host: 174061244, status:
[1/500] Host: 174061244, status: new
[2/500] Host: 174061244, status: new
[3/500] Host: 174061244, status: new
[4/500] Host: 174061244, status: new
[5/500] Host: 174061244, status: new
[6/500] Host: 174061244, status: new
[7/500] Host: 174061244, status: new
[8/500] Host: 174061244, status: new
[9/500] Host: 174061244, status: new
[10/500] Host: 174061244, status: new
[11/500] Host: 174061244, status: active
Inlets OSS exit-node summary:
  IP: 157.245.41.205
  Auth-token: RgsuIGVPhiPuO6e67MvYOU2o4abwSzVc4zUCCO4sx4XCLxNwrbpj6oqSPAFMI6Cr

Command:
  export UPSTREAM=http://127.0.0.1:8000
  inlets client --remote "ws://157.245.41.205:8080" \
	--token "RgsuIGVPhiPuO6e67MvYOU2o4abwSzVc4zUCCO4sx4XCLxNwrbpj6oqSPAFMI6Cr" \
	--upstream $UPSTREAM

To Delete:
  inletsctl delete --provider digitalocean --id "174061244"

How are existing users impacted? What migration steps/scripts do we need?

Checklist:

I have:

• updated the documentation and/or roadmap (if required)
• read the CONTRIBUTION guide
• signed-off my commits with git commit -s
• added unit tests

[alexellis]

LGTM