[sssd PR#918][comment] Add support for NSS hosts database lookup.

[scabrero]

URL: https://github.com/SSSD/sssd/pull/918
Title: #918: Add support for NSS hosts database lookup.

scabrero commented:
"""
Fixed, I have skipped `sssd-ldap-attributes.5.xml` because other `ldap_*_entry_usn` are not there either. I have also fixed a couple of issues I found while working in  the networks support.
"""

See the full comment at https://github.com/SSSD/sssd/pull/918#issuecomment-594436135