##### 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
```

#
#
#
#
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import json
import os
import os.path
import stat
import tempfile
import traceback
from ansible import constants as C
from ansible.errors import AnsibleError, AnsibleFileNotFound
from ansible.module_utils.basic import FILE_COMMON_ARGUMENTS
from ansible.module_utils._text import to_bytes, to_native, to_text
from ansible.module_utils.parsing.convert_bool import boolean
from ansible.plugins.action import ActionBase
from ansible.utils.hashing import checksum
REAL_FILE_ARGS = frozenset(FILE_COMMON_ARGUMENTS.keys()).union(
                          ('state', 'path', '_original_basename', 'recurse', 'force',
                           '_diff_peek', 'src')).difference(
                          ('content', 'decrypt', 'backup', 'remote_src', 'regexp', 'delimiter',
                           'directory_mode', 'unsafe_writes'))
def _create_remote_file_args(module_args):
    """remove keys that are not relevant to file"""
    return dict((k, v) for k, v in module_args.items() if k in REAL_FILE_ARGS)
def _create_remote_copy_args(module_args):