[SSSD] [sssd PR#927][comment] Add processing to save errno before outputting DEBUG

[centos-ci]

URL: https://github.com/SSSD/sssd/pull/927
Title: #927: Add processing to save errno before outputting DEBUG

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

See the full comment at https://github.com/SSSD/sssd/pull/927#issuecomment-549432561