second (and third) bugs in SCSI (esp) emulation

It looks like "Message Accepted" shouldn't write a response. At least ESP_RFLAGS must definetely be 0.

After I fixed the bug, OBP got one step further. Now it sees the targets:

ok probe-scsi
Target 0
scsi-disk: Unsupported command length, command 60
scsi-disk: Unsupported command length, command 60
scsi-disk: Unsupported command length, command c0
scsi-disk: Unsupported command length, command c0
scsi-disk: Unsupported command length, command e0
scsi-disk: Unsupported command length, command e0
Target 2
scsi-disk: Unsupported command length, command 60
scsi-disk: Unsupported command length, command 60
scsi-disk: Unsupported command length, command c0
scsi-disk: Unsupported command length, command c0
scsi-disk: Unsupported command length, command e0
scsi-disk: Unsupported command length, command e0
ok

Next stop is inquiring targets parameters.