Implement IcingaPrecacheFallback option for the init script.

Refs #4968
Fix ido2db initscript.

- removed mixed indentation
- modified status check to be LSB conform
- changed structure of status check

Signed-off-by: Michael Friedrich <michael.friedrich@netways.de>

Refs #4825
Merge branch 'fix/ido2db-init-4825' into support/1.10

Fixes #4825
Add Marco Hoyer to THANKS.

Refs #4825
Merge branch 'feature/safe-start-4968' into support/1.10

Fixes #4968
Fetch latest docs revision.
Update Changelog.

Refs #4968
Refs #5434
Refs #4427
Refs #4825
Refs #5263
Refs #5545