Add {host,service}{groups,status] columns: notes, notes_url, action_url, is_reachable.

Refs #6060
Merge branch 'support/1.11' of git.icinga.org:icinga-core into support/1.11
IDOUtils: Add is_reachable columns for {host,service}status tables.
Update Changelog.

Refs #6060
Refs #6094