Sample configuration files for:
```
SystemD: groestlcoind.service
Upstart: groestlcoind.conf
OpenRC:  groestlcoind.openrc
         groestlcoind.openrcconf
CentOS:  groestlcoind.init
macOS:    org.groestlcoin.groestlcoind.plist
```
have been made available to assist packagers in creating node packages here.

See doc/init.md for more information.
