Better solution for sysconfig defaults and systemd units

[lazyfrosch]

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While working on https://github.com/Icinga/deb-icinga2/issues/4 I noticed a difference in how environment defaults work.

RPM: /etc/sysconfig/icinga2
Debian: /etc/default/icinga / /usr/lib/icinga2/icinga2

We should update this for both systems:

• Compiled in defaults should be installed under /usr/lib/icinga2/environment
• /etc/{sysconfig,default}/icinga2 should only be a placeholder for user changes
• Add this behavior for RPM
• Drop custom systemd files/defaults for Debian

This is for >= 2.9

[Al2Klimov]

@htriem Shall we do this and why (not)?

[htriem]

I'd agree that it is a lot cleaner in the way @lazyfrosch described it. However, especially with dropping the systemd-files, this should be a feature for the next major.