Use process::uid.change_priv here too, just like in the upstart provider.
Use process::uid.change_priv here too, just like in the upstart provider.

This sets both uid and euid. Also moves the priv drop until after we
write the pid file since that should happen with root privs I think. 
poise/poise-service,poise/poise-service,poise/poise-service