Allow any_errors_fatal to be set in playbook - fixes #30691 (#30839)

* Allow any_errors_fatal to be set in playbook.
* Default to the config file value for any_errors_fatal only if it isn't already provided.
* add _get_attr method

lib/ansible/playbook/base.py

@@ -165,7 +165,7 @@ class Base(with_metaclass(BaseMeta, object)):
     _ignore_errors       = FieldAttribute(isa='bool')
     _check_mode          = FieldAttribute(isa='bool')
     _diff                = FieldAttribute(isa='bool')
-    _any_errors_fatal     = FieldAttribute(isa='bool', default=C.ANY_ERRORS_FATAL, always_post_validate=True)
+    _any_errors_fatal    = FieldAttribute(isa='bool')
 
     # param names which have been deprecated/removed
     DEPRECATED_ATTRIBUTES = [

lib/ansible/playbook/task.py

@@ -21,6 +21,7 @@ __metaclass__ = type
 
 import os
 
+from ansible import constants as C
 from ansible.errors import AnsibleError, AnsibleParserError, AnsibleUndefinedVariable
 from ansible.module_utils.six import iteritems, string_types
 from ansible.module_utils._text import to_native
@@ -422,6 +423,14 @@ class Task(Base, Conditional, Taggable, Become):
 
         return value
 
+    def _get_attr_any_errors_fatal(self):
+        value = self._attributes['any_errors_fatal']
+        if value is None:
+            value = self._get_parent_attribute('any_errors_fatal')
+        if value is None:
+            value = C.ANY_ERRORS_FATAL
+        return value
+
     def _get_attr_environment(self):
         '''
         Override for the 'tags' getattr fetcher, used from Base.