fix: broker connectivity issues

[estilles]

Issue reported by João Lima via Slack

• client wasn't disconnecting from broker on reconfig/reconnect
• client wasn't disconnection on instance removal/destroy

Resolves #13

Signed-off-by: Johnny Estilles johnny@estilles.com

[Julusian]

Thanks, I have rebased this on the overhaul for companion 3.0, so expect it to be available once 3.0 hits beta