[SSSD] [sssd PR#937][comment] Unify the indentation to 4 spaces

[centos-ci]

URL: https://github.com/SSSD/sssd/pull/937
Title: #937: Unify the indentation to 4 spaces

centos-ci commented:
"""
Can one of the admins verify this patch?
"""

See the full comment at https://github.com/SSSD/sssd/pull/937#issuecomment-553500886