Register missing parameter reboot_timeout (#46585)

(cherry picked from commit 753711cd12)

changelogs/fragments/reboot_missing_parameter.yaml

@@ -0,0 +1,2 @@
+bugfixes:
+- reboot - add reboot_timeout parameter to the list of parameters so it can be used.

lib/ansible/plugins/action/reboot.py

@@ -28,7 +28,7 @@ class TimedOutException(Exception):
 
 class ActionModule(ActionBase):
     TRANSFERS_FILES = False
-    _VALID_ARGS = frozenset(('connect_timeout', 'msg', 'post_reboot_delay', 'pre_reboot_delay', 'test_command'))
+    _VALID_ARGS = frozenset(('connect_timeout', 'msg', 'post_reboot_delay', 'pre_reboot_delay', 'test_command', 'reboot_timeout'))
 
     DEFAULT_REBOOT_TIMEOUT = 600
     DEFAULT_CONNECT_TIMEOUT = None