qemu-iotests: Remove CR line endings in reference output

qemu doesn't print these CRs any more. The test still didn't fail
because the output comparison ignores line endings, but the change turns
up each time when you want to update the output.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
diff --git a/tests/qemu-iotests/051.out b/tests/qemu-iotests/051.out
index 671ac5f..a631b0b 100644
--- a/tests/qemu-iotests/051.out
+++ b/tests/qemu-iotests/051.out
@@ -44,11 +44,11 @@
 === Overriding backing file ===
 
 Testing: -drive file=TEST_DIR/t.qcow2,driver=qcow2,backing.file.filename=TEST_DIR/t.qcow2.orig -nodefaults
-QEMU X.Y.Z monitor - type 'help' for more information

-(qemu) iininfinfoinfo info binfo blinfo bloinfo blocinfo block

-ide0-hd0: TEST_DIR/t.qcow2 (qcow2)

-    Backing file:     TEST_DIR/t.qcow2.orig (chain depth: 1)

-(qemu) qququiquit

+QEMU X.Y.Z monitor - type 'help' for more information
+(qemu) iininfinfoinfo info binfo blinfo bloinfo blocinfo block
+ide0-hd0: TEST_DIR/t.qcow2 (qcow2)
+    Backing file:     TEST_DIR/t.qcow2.orig (chain depth: 1)
+(qemu) qququiquit
 
 
 === Enable and disable lazy refcounting on the command line, plus some invalid values ===