##### 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
```

cols.insert(4, None)  
        if cols[5] not in PG_HBA_METHODS:
            raise PgHbaValueError("Rule {0} of '{1}' type has invalid auth-method '{2}'".format(line, cols[0], cols[5]))
        if len(cols) < 7:
            cols.insert(6, None)  
        else:
            cols[6] = " ".join(cols[6:])  
        rule = dict(zip(PG_HBA_HDR, cols[:7]))
        for key, value in rule.items():
            if value:
                self[key] = value
    def key(self):
        '''
        This method can be used to get the key from a rule.
        '''
        if self['type'] == 'local':
            source = 'local'
        else:
            source = str(self.source())
        return (source, self['db'], self['usr'])
    def source(self):
        '''
        This method is used to get the source of a rule as an ipaddress object if possible.
        '''
        if 'mask' in self.keys():
            try:
                ipaddress.ip_address(u'{0}'.format(self['src']))
            except ValueError:
                raise PgHbaValueError('Mask was specified, but source "{0}" '
                                      'is no valid ip'.format(self['src']))