Revert "crushtool: safeguard for missing --num-rep when --test"

This reverts commit 10b8966c8da38f8ae5ac7dbb2e16a5e45e502ba3.
Merge pull request #2512 from dachary/wip-9490-crushtool-num-rep

Revert "crushtool: safeguard for missing --num-rep when --test"

Reviewed-by: John Spray <john.spray@redhat.com>