[SSSD] [sssd PR#5297][comment] Fix IP network by address lookup

[scabrero]

URL: https://github.com/SSSD/sssd/pull/5297
Title: #5297: Fix IP network by address lookup

scabrero commented:
"""
Changes from previous version:
- Rebase master
- Expand comment to note `inet_ntop()`expects network byte order as well.
- Fix test_netbyaddr calling `call_sssd_getnetbyname()` instead of `call_sssd_getnetbyaddr()`
- Expand `test_netbyaddr` to check `getnetbyaddr` with `AF_INET` and `AF_UNSPEC`
"""

See the full comment at https://github.com/SSSD/sssd/pull/5297#issuecomment-700594060