tests/random-utils: print seed
tests/random-utils: print seed

Knowning the seed will make it easier to investigate failures in
randomised tests.

avikivity/scylla,duarten/scylla,scylladb/scylla,scylladb/scylla,avikivity/scylla,scylladb/scylla,duarten/scylla,avikivity/scylla,duarten/scylla,scylladb/scylla