fix: workaround for zeromq connection bug

[coolaj86]

Re zeromq/zeromq.js#574 and #98 (comment)

[coolaj86]

Note: calling process.exit(1) since there is no errback to properly handle errors and this is a fatal error that would make the instance completely unusable - at least for the use cases I'm aware of (not sure how having an API service that can only return errors is helpful).

Choosing 5 seconds because a valid network connection would have TCP rejected, TCP accepted or 'no-route-to-host'ed by then.

Only an invalid address or a firewall DROP should cause this.