Fix OSX defaults for lists

In modern ansible, parameters default to string type.  This causes
issues for polymorphic parameters like this module's value param.  note
that this fix restores ansible-2.0 and previous behaviour but it is not
perfect.  If a parameter is specified via key=value or given on the
commandline then it will be a string before it reaches the module code.
There's nothing we can do about that.

Fixes #19585

lib/ansible/modules/system/osx_defaults.py

@@ -116,7 +116,9 @@ EXAMPLES = '''
 '''
 
 import datetime
-from ansible.module_utils.basic import *
+import re
+
+from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.pycompat24 import get_exception
 
 # exceptions --------------------------------------------------------------- {{{
@@ -380,6 +382,7 @@ def main():
             value=dict(
                 default=None,
                 required=False,
+                type='raw'
             ),
             state=dict(
                 default="present",