Title: #690: DYNDNS: Convert dyndns timer to be_ptask
Where did you get this 60 seconds limit? I can not find it in original code:
if (period < 60) period = 60;
Also please remove `be_nsupdate_init_timer` as it is now only used in tests and update
tests. Otherwise it looks good.
See the full comment at https://github.com/SSSD/sssd/pull/690#issuecomment-436246385