vhost-user-blk-test needs the qemu-storage-daemon, otherwise it
currently hangs. So make sure that we build the daemon before running
the tests.

Message-Id: <20210811094705.131314-1-thuth@redhat.com>
Tested-by: Alexander Bulekov <alxndr@bu.edu>
Signed-off-by: Thomas Huth <thuth@redhat.com>