iotests: fix 181: enable postcopy-ram capability on target

Migration capabilities should be enabled on both source and
destination qemu processes.
Signed-off-by: NVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/181

@@ -93,7 +93,9 @@ echo
 
 # Slow down migration so much that it definitely won't finish before we can
 # switch to postcopy
+# Enable postcopy-ram capability both on source and destination
 silent=yes
+_send_qemu_cmd $dest 'migrate_set_capability postcopy-ram on' "(qemu)"
 _send_qemu_cmd $src 'migrate_set_speed 4k' "(qemu)"
 _send_qemu_cmd $src 'migrate_set_capability postcopy-ram on' "(qemu)"
 _send_qemu_cmd $src "migrate -d unix:${MIG_SOCKET}" "(qemu)"

tests/qemu-iotests/181.out

@@ -20,7 +20,6 @@ read 65536/65536 bytes at offset 0
 
 === Do some I/O on the destination ===
 
-QEMU X.Y.Z monitor - type 'help' for more information
 (qemu) qemu-io disk "read -P 0x55 0 64k"
 read 65536/65536 bytes at offset 0
 64 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)