[SSSD] [sssd PR#682][comment] DYNDNS: Drop support for legacy NSUPDATE

[jhrozek]

URL: https://github.com/SSSD/sssd/pull/682
Title: #682: DYNDNS: Drop support for legacy NSUPDATE

jhrozek commented:
"""
CI "passed" (modulo an error due to some unrelated package upgrade), so ACK
"""

See the full comment at https://github.com/SSSD/sssd/pull/682#issuecomment-434455564