Description of problem:
sssctl config-check giving the wrong error message when there are only snippet
files and no sssd. conf

Version-Release number of selected component (if applicable):
sssd-2.0.0-38.el8.x86_64

How reproducible:
Always

Steps to Reproduce:
1. Create snippet file under /etc/sssd/conf.d
2. change the ownership and permissions to root:root and 600
3. Start the sssd service
4. Check user lookup
5. Run # sssctl config-check

Actual results:
# sssctl config-check
File /etc/sssd/sssd.conf does not exist. SSSD will use default configuration
with files provider.
File ownership and permissions check failed. Expected root:root and 0600.


Expected results:
Here snippet file is added with proper ownership and permission and sssd does
not use the default configuration as files provider.

Additional info:

# ll /etc/sssd/conf.d/01.conf
-rw-------. 1 root root 381 Jan 15 08:15 /etc/sssd/conf.d/01.conf


# cat /etc/sssd/conf.d/01.conf
[sssd]
config_file_version = 2
domains = LDAP
services = nss, pam

[domain/LDAP]
ldap_search_base = dc=example,dc=com
debug_level = 9
id_provider = ldap
auth_provider = ldap
ldap_user_home_directory = /home/%u
ldap_uri = ldaps://server.example.com:636
ldap_tls_cacert = /etc/openldap/certs/cacert.pem
use_fully_qualified_names = True

[nss]

[pam]

# getent passwd testuser@LDAP
testuser@LDAP:*:14583101:14564100:testuser User::/bin/bash