Fix notification reference to runit service, delay notification until end of chef run

Fixes the reference to the runit service, fixing the following bug:

```
FATAL: Chef::Exceptions::ResourceNotFound: resource git[/usr/share/statsd] is configured to notify resource runit_service[statsd] with action restart, but runit_service[statsd] cannot be found in the resource collection. git[/usr/share/statsd] is defined in /var/cache/chef/cookbooks/statsd/recipes/default.rb:5:in `from_file'
```

Added the delay flag to consolidate multiple restarts when code and configuration are deployed