Title: #5549: data_provider: Configure backend probing interval
just a general comment, please use `sss_rand()`. It makes sure `srand()` is called and
would help if we want to use different general purpose random numbers in SSSD.
I changed the description from sss_rand() to rand() only for MAN page. Internally
implementation is still based on sss_rand().
Btw - can you take look how MAN page modified in this PR looks like for: offline_timeout,
offline_timeout_max and refresh_max_random_offset. As they are related to each other I
needed to refactor a bit all 3 entries and I am not sure if final description is good
See the full comment at https://github.com/SSSD/sssd/pull/5549#issuecomment-808157134