
##### SUMMARY
This line of code will traceback on Python2 if a vaulted string contains non-ascii characters:

https://github.com/ansible/ansible/blob/devel/lib/ansible/parsing/yaml/objects.py#L131

The function should be defined like this:
``` python
    def __str__(self):
        return to_native(self.data, errors='surrogate_or_strict')
```

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/parsing/yaml/objects.py

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
Current devel (2.9) and previous versions
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below

```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->


##### STEPS TO REPRODUCE
I'm not sure if the current ```__str__()``` method ever gets called on Python2.  A quick test by tracing the following playbook shows that ```__unicode__()``` gets called in that playbook.  

```
---
- hosts: localhost
  gather_facts: False
  vars:
    the_secret: !vault |
          $ANSIBLE_VAULT;1.1;AES256
          62666630343233373162323132363462633332356664636165616339303536333334366231303963
          6433666337653864653163623063353932386130646530370a303234633037383966343366343037
          39336433656461656261326165643431633363313562343764373136613338363039366136366439
          6666633836343935660a396336393834326232383636613665316133666464393834623831326562
          6165
  tasks:
  - debug: msg="{{ the_secret }}"
```
(Vault password is 12345)

It probably should be fixed, though, as all it will take to provoke a UnicodeError is some piece of code being changed to do ```'%s' % vault_encrypted_variable_with_non_ascii_chars```.  The %s format string will use ```__str__()``` instead of ```__unicode__()``` and provoke the error.

<!--- HINT: You can paste gist.github.com links for larger files -->

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->


##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->

<!--- Paste verbatim command output between quotes -->
```paste below

```

#
#
#
#
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import yaml
from ansible.module_utils.six import text_type
from ansible.module_utils._text import to_bytes, to_text
class AnsibleBaseYAMLObject(object):