##### SUMMARY
When configuring multiple inventory sources in `ansible.cfg`, you cannot add a space after the comma.

##### ISSUE TYPE
- Bug Report

##### COMPONENT NAME
config

##### ANSIBLE VERSION
<!--- Paste verbatim output from "ansible --version" between quotes -->
```paste below
ansible 2.10.0.dev0
  config file = /home/alwyn/tmp/inventory-test/ansible.cfg
  configured module search path = ['/home/alwyn/.ansible/plugins/modules', '/usr/share/ansible/plugins/modules']
  ansible python module location = /home/alwyn/.local/opt/pyenv/versions/3.8.1/envs/inventory-test/lib/python3.8/site-packages/ansible
  executable location = /home/alwyn/.local/opt/pyenv/versions/3.8.1/envs/inventory-test/bin/ansible
  python version = 3.8.1 (default, Feb 21 2020, 15:48:23) [GCC 9.2.1 20200130]
```

##### CONFIGURATION
<!--- Paste verbatim output from "ansible-config dump --only-changed" between quotes -->
```paste below
DEFAULT_HOST_LIST(/home/alwyn/tmp/inventory-test/ansible.cfg) = ['/home/alwyn/tmp/inventory-test/hosts', '/home/alwyn/tmp/inventory-test/ hosts2']
```

##### OS / ENVIRONMENT
<!--- Provide all relevant information below, e.g. target OS versions, network device firmware, etc. -->
Any/all (Linux?) platforms. Not sure about Windows.

I'm on Archlinux with kernel 5.5.4-zen1-1-zen.

##### STEPS TO REPRODUCE
<!--- Describe exactly how to reproduce the problem, using a minimal test-case -->
Configure `default.inventory` in `ansible.cfg` like so:
```
[defaults]
inventory      = hosts-foo, hosts-bar
```

1. Create two inventory files
   - `hosts-foo` with contents
     ```
     [foo]
     localhost
     ```
   - `hosts-bar` with contents
     ```
     [bar]
     localhost
     ```
1. `ansible bar -m ping`

##### EXPECTED RESULTS
<!--- Describe what you expected to happen when running the steps above -->
The `bar` hostgroup is found and the ping module runs against localhost.

##### ACTUAL RESULTS
<!--- Describe what actually happened. If possible run with extra verbosity (-vvvv) -->
The `bar` hostgroup is not found as it tries to find it in `$directory/ hosts-bar` instead of `$directory/hosts-bar`.

<!--- Paste verbatim command output between quotes -->
```paste below
[WARNING]: You are running the development version of Ansible. You should only run Ansible from "devel" if you are modifying the Ansible engine, or trying out features under development.
This is a rapidly changing source of code and can become unstable at any point.
[WARNING]: Unable to parse /home/alwyn/tmp/inventory-test/ hosts-bar as an inventory source
[WARNING]: Could not match supplied host pattern, ignoring: bar
[WARNING]: No hosts matched, nothing to do
```

##### FURTHER DETAILS

This should get fixed by #67701.
from __future__ import (absolute_import, division, print_function)
__metaclass__ = type
import atexit
import io
import os
import os.path
import sys
import stat
import tempfile
import traceback
from collections import namedtuple