New module icinga2_downtime (#11462)
* feat: Icinga 2 downtime module added allowing to schedule and remove downtimes through its REST API.
* ensure compatibility with ModuleTestCase
feat: errors raised from MH now contain the changed flag
ref: move module exit out of the decorated run method
* revised module
ref: module refactored using StateModuleHelper now
ref: suggested changes by reviewer added
* revert change regarding changed flag in MH
* refactoring and set changed flag explicitly on error
* Check whether there was a state change on module failure removed.
* ref: test cases migrated to the new feature that allows passing through exceptions
* Update plugins/module_utils/icinga2.py
* Update plugins/module_utils/icinga2.py
* Update plugins/modules/icinga2_downtime.py
* ref: make module helper private
* fix: ensure that all non-null values are added to the request otherwise a `false` value is dropped
* ref: module description extended with the note that check mode is not supported
* Update plugins/modules/icinga2_downtime.py
* fix: documentation updated
* ref: documentation updated
ref: doc fragment added
* Update plugins/doc_fragments/icinga2_api.py
* ref: doc fragment renamed to `_icinga2_api.py`
* ref: maintainer to doc fragment in BOTMETA.yml added
* Update plugins/modules/icinga2_downtime.py
* Update plugins/modules/icinga2_downtime.py
* Update plugins/modules/icinga2_downtime.py
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(cherry picked from commit ce7cb4e914)
Signed-off-by: Fiehe Christoph <c.fiehe@eurodata.de>
Co-authored-by: Christoph Fiehe <cfiehe@users.noreply.github.com>
Co-authored-by: Fiehe Christoph <c.fiehe@eurodata.de>
Co-authored-by: Felix Fontein <felix@fontein.de>
Co-authored-by: Alexei Znamensky <103110+russoz@users.noreply.github.com>
