bootstrap: different packages for 'which'
bootstrap: different packages for 'which'

Either debianutils or which.

Signed-off-by: Yehuda Sadeh <48638f9c2a62c4fd20be28d0bdad68f5cd041402@redhat.com>

andrewgaul/s3-tests,andrewgaul/s3-tests,ceph/s3-tests,ceph/s3-tests,robbat2/s3-tests,robbat2/s3-tests