http.Server.Shutdown gracefully closes listeners/clients, we do not have to
do it ourselves. Making util/signals accept func() instead of io.Closer
allowed for the removal of network/closer.go and util/signals/closers.go.
* Gofmt friendly
Keeping Go source code in line with what they preconize
* Golint Friendly Next
So I have made some variables unexported
Added comments in every function that I know what it does
Removed some deprecated stuff that I was sure of
Added a comment on possible deprecated methods "Is it deprecated?"
Changed some variable/method name according to golint recommendations
* Update filelist.go
This makes systemd not put unit into fail mode when stopping
INFO:
* make sure to use signals.RegisterCloser for everything that should be closed on interrupt
* for any net.Listeners created make sure to wrap them with network.WrapListener and register with signals.RegisterCloser
