Init script: Fix shell redirection.
Fix type name.
icinga2.spec: show some love for proper builds

- icinga2 binary location changed to sbin/
- new initscript
- itl is installed into share/
- man pages in man/
- use name macro for every 'icinga2' occurence
- add a changelog

update to 0.0.2 release

fixes #4050
Rename .txt files to .adoc.