Hotfixes v0.8.1 r2

Disable registration by default. Add script to register new users. 

It existed but was hardcoded to True.
Give it an underscore for consistency.
Also don't pull in syweb unless we're actually using the web client.

Fix ban

Don't block waiting on waking up all the listeners when sending an event

actually uphold the bind_host parameter. in theory should make ipv6 binds work like bind_host: 'fe80::1%lo0'

Metrics