iotests: Fix 083

As of 8f9e835f, probing should be
disabled in the qemu-iotests (at least when using qemu-io). This broke
083's reference output (which consisted mostly of "Could not read image
for determining its format").

This patch fixes it.

Note that one case which failed before is now successful: Disconnect
after data. This is due to qemu having read twice before (once for
probing, once for the qemu-io read command), but only once now (the
qemu-io read command). Therefore, reading is successful (which is
correct).
Signed-off-by: NMax Reitz <mreitz@redhat.com>
Reviewed-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/083.out

@@ -62,8 +62,7 @@ no file open, try 'help open'
 === Check disconnect after neg2 ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect 8 neg2 ===
 
@@ -80,49 +79,43 @@ no file open, try 'help open'
 === Check disconnect before request ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect after request ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect before reply ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect after reply ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect 4 reply ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect 8 reply ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect before data ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT:exportname=foo: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 === Check disconnect after data ===
 
 
-read failed: Input/output error
+read 512/512 bytes at offset 0
+512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
 === Check disconnect before neg-classic ===
 
@@ -157,7 +150,6 @@ no file open, try 'help open'
 === Check disconnect after neg-classic ===
 
 
-qemu-io: can't open device nbd:127.0.0.1:PORT: Could not read image for determining its format: Input/output error
-no file open, try 'help open'
+read failed: Input/output error
 
 *** done