monit fails to bind to TCP port after reboot under Ubuntu 16.04

[rkeiii]

I started seeing this after switching from Ubuntu 14.04 to 16.04 as my base image. In this situation monit starts too early in the boot process and never gets bound to it's TCP port. If you simply restart monit after bootup completes it binds normally to it's port.

An easy fix is to add "After=network-online.target" to the systemd monit.service file created by poise-service.