Moved unsecure sss_rand() out of crypto lib
sss_rand() was:
- moved out of crypto lib,
- non security relevant purpose was emphasized
- attempt to "use RAND_bytes() if available" was removed to simplify
things and make return value compatible with rand()
Resolves:
https://pagure.io/SSSD/sssd/issue/4024#comment-603526 parts (1) and (3)
Reviewed-by: Simo Sorce <simo@redhat.com>
Reviewed-by: Tomáš Halman <thalman@redhat.com>