Name of config host should be configureable

[mkayontour]

The default of an Ansible FQDN is not right, when in clouds hostnames could be random by default and not known beforehand.

ansible-collection-icinga/roles/icinga2/tasks/objects.yml

Line 5 in 98392d6

tmp_objects: "{{ tmp_objects| default([]) + hostvars[item]['icinga2_objects'][ansible_fqdn] }}"