##### SUMMARY
If a module sets `add_file_common_args=True` when calling `AnsibleModule`, all elements from [FILE_COMMON_ARGUMENTS](https://github.com/ansible/ansible/blob/e9d29b1fe4285d90d7a4506b80260a9e24c3bcea/lib/ansible/module_utils/basic.py#L229-L257) are included in the argument spec. The [files document fragment](https://github.com/ansible/ansible/blob/e9d29b1fe4285d90d7a4506b80260a9e24c3bcea/lib/ansible/plugins/doc_fragments/files.py#L15-L80) only documents a subset of them, though. Missing are:
 - src
 - follow
 - force
 - content
 - backup
 - remote_src
 - regexp
 - delimiter
 - directory_mode

Most module authors using `add_file_common_args=True` are probably not aware that their modules have these options as well.

I don't think these extra options should be added by default if `add_file_common_args=True` is specified.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
lib/ansible/module_utils/basic.py

##### ANSIBLE VERSION
```
devel
```

'''
        Find system executable in PATH.
        :param arg: The executable to find.
        :param required: if executable is not found and required is ``True``, fail_json
        :param opt_dirs: optional list of directories to search in addition to ``PATH``
        :returns: if found return full path; otherwise return None
        '''
        bin_path = None
        try:
            bin_path = get_bin_path(arg=arg, opt_dirs=opt_dirs)
        except ValueError as e:
            if required:
                self.fail_json(msg=to_text(e))
            else:
                return bin_path
        return bin_path
    def boolean(self, arg):