Swap default for INVALID_TASK_ATTRIBUTE_FAILED to True

[sivel]

SUMMARY

Swap default for INVALID_TASK_ATTRIBUTE_FAILED to True, add additional info to exception

ISSUE TYPE

• Feature Pull Request

COMPONENT NAME

lib/ansible/config/base.yml
lib/ansible/playbook/task.py

ANSIBLE VERSION

2.7

ADDITIONAL INFORMATION

[mattclay]

@sivel This change is breaking the aws_elasticbeanstalk_app integration test:

2018-08-17 04:25:27 ERROR! 'ignore_error' is not a valid attribute for a Task
2018-08-17 04:25:27 
2018-08-17 04:25:27 The error appears to have been in '/root/ansible/test/integration/targets/aws_elasticbeanstalk_app/tasks/main.yml': line 121, column 5, but may
2018-08-17 04:25:27 be elsewhere in the file depending on the exact syntax problem.
2018-08-17 04:25:27 
2018-08-17 04:25:27 The offending line appears to be:
2018-08-17 04:25:27 
2018-08-17 04:25:27   # ============================================================
2018-08-17 04:25:27   - name: delete non existent app
2018-08-17 04:25:27     ^ here
2018-08-17 04:25:27 
2018-08-17 04:25:27 This error can be suppressed as a warning using the "invalid_task_attribute_failed" configuration

Other tests that are excluded from smoke tests may also be impacted.

[bcoca]

@mattclay actually 'working as intended', the test is incorrect, it should be plural ignore_errors

[mattclay]

@bcoca Yes, @sivel fixed this in #44317