New module: shutdown (#700)

* New module: shutdown

* Add symlink to plugin

* Fix

Signed-off-by: Amin Vakil <info@aminvakil.com>

* Fix

* Fix

* Add seealso

* Fix seealso

* Add future-import, metaclass boilerplate

* Change pre_shutdown_delay to delay

* Cleanup before executing shutdown

* Fix

* Remove unused connect_timeout paramater

* Improve documentation

* Remove deprecated function and calling it

* Remove double calling delay function

* Remove unneeded call in check delay function

* Make check mode more realistic

* Remove extra blank line

* Remove unnecessary imports and fix copyright year

* Add shutdown_command and integration test

* Fix integration test

* Don't fail on local AND enabled check_mode

* Add copyright

* Skip ubuntu1804 as systemd-sysv is not installed on container

* Ignore ubuntu 18 on task

* Readd integration tests

* Do not run integration test on ubuntu 18

* Improve integration test and add delay, msg testing

* Fix ubuntu 18 integration test

* Remove unnecessary condition

plugins/modules/system/shutdown.py

@@ -0,0 +1,68 @@
+#!/usr/bin/python
+# -*- coding: utf-8 -*-
+# Copyright: (c) 2020, Ansible Project
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+from __future__ import (absolute_import, division, print_function)
+__metaclass__ = type
+
+
+DOCUMENTATION = r'''
+module: shutdown
+short_description: Shut down a machine
+notes:
+  - C(PATH) is ignored on the remote node when searching for the C(shutdown) command. Use I(search_paths)
+    to specify locations to search if the default paths do not work.
+description:
+    - Shut downs a machine.
+version_added: "1.1.0"
+options:
+  delay:
+    description:
+      - Seconds to wait before shutdown. Passed as a parameter to the shutdown command.
+      - On Linux, macOS and OpenBSD, this is converted to minutes and rounded down. If less than 60, it will be set to 0.
+      - On Solaris and FreeBSD, this will be seconds.
+    type: int
+    default: 0
+  msg:
+    description:
+      - Message to display to users before shutdown.
+    type: str
+    default: Shut down initiated by Ansible
+  search_paths:
+    description:
+      - Paths to search on the remote machine for the C(shutdown) command.
+      - I(Only) these paths will be searched for the C(shutdown) command. C(PATH) is ignored in the remote node when searching for the C(shutdown) command.
+    type: list
+    elements: path
+    default: ['/sbin', '/usr/sbin', '/usr/local/sbin']
+
+seealso:
+- module: ansible.builtin.reboot
+author:
+    - Matt Davis (@nitzmahone)
+    - Sam Doran (@samdoran)
+    - Amin Vakil (@aminvakil)
+'''
+
+EXAMPLES = r'''
+- name: Unconditionally shut down the machine with all defaults
+  community.general.shutdown:
+
+- name: Delay shutting down the remote node
+  community.general.shutdown:
+    delay: 60
+
+- name: Shut down a machine with shutdown command in unusual place
+  community.general.shutdown:
+    search_paths:
+     - '/lib/molly-guard'
+'''
+
+RETURN = r'''
+shutdown:
+  description: C(true) if the machine has been shut down.
+  returned: always
+  type: bool
+  sample: true
+'''