implemented sourcing of default file for sysvinit

[root360-AndreasUlm]

1. What does this change do, exactly?

It allow to overwrite the variables used in the sysvinit script by providing the file caddy in either /etc/default/ (Debian based https://www.debian.org/doc/manuals/debian-reference/ch03.en.html#_the_default_parameter_for_each_init_script ) or in /etc/sysconfig/ (CentOS based https://www.centos.org/docs/5/html/5.2/Deployment_Guide/s1-sysconfig-files.html ).

That way the server administrators can easily increase the ulimit and change installation paths if necessary.

2. Please link to the relevant issues.

None

3. Which documentation changes (if any) need to be made because of this PR?

Already documented in README

4. Checklist

• I have written tests and verified that they fail without my change (tested on my systems)
• I have squashed any insignificant commits (tried but got merge conflicts)
• This change has comments for package types, values, functions, and non-obvious lines of code
• I am willing to help maintain this change if there are issues with it later

[CLAassistant]

All committers have signed the CLA.

[mholt]

There's no opposition to this change as far as I can see, so I'll merge it in. Thank you!