##### 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
```

if param is None:
            param = self.params
        return count_terms(check, param)
    def _check_mutually_exclusive(self, spec, param=None):
        if param is None:
            param = self.params
        try:
            check_mutually_exclusive(spec, param)
        except TypeError as e:
            msg = to_native(e)
            if self._options_context:
                msg += " found in %s" % " -> ".join(self._options_context)
            self.fail_json(msg=msg)
    def _check_required_one_of(self, spec, param=None):
        if spec is None:
            return
        if param is None:
            param = self.params
        try:
            check_required_one_of(spec, param)
        except TypeError as e:
            msg = to_native(e)
            if self._options_context:
                msg += " found in %s" % " -> ".join(self._options_context)
            self.fail_json(msg=msg)
    def _check_required_together(self, spec, param=None):