Fix debian init script default loading.

[wtcross]

DAEMON_ARGS needs to be set after defaults are loaded to facilitate overrides. The following order is now in place:

1. load defaults
2. check if daemon is executable
3. set DAEMON_ARGS

This change is useful when installing in some other directory prefix other than /opt/nutcracker. I'm using fpm and would like to use the scripts/nutcracker.init.debian init script when packaging.

[CLAassistant]

Thank you for your submission! We really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.

---

Tyler Cross seems not to be a GitHub user. You need a GitHub account to be able to sign the CLA. If you have already a GitHub account, please add the email address used for this commit to your account.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}