qa/standalone/bluefs: Fix CBT bluefs-bdev-expand

There was a problem when expansion of 'block' device crossed location
of bdev label copy. The extra label that did not exist before and now
exists was not initialized.
This makes test to fail.

Signed-off-by: Adam Kupczyk <[email protected]>

Author: aclamk

qa/standalone/osd/osd-bluefs-volume-ops.sh

@@ -72,7 +72,7 @@ function TEST_bluestore() {
 
     truncate $dir/0/block -s 4294967296 # 4GB
     ceph-bluestore-tool --path $dir/0 bluefs-bdev-expand || return 1
-    truncate $dir/1/block -s 4311744512 # 4GB + 16MB
+    truncate $dir/1/block -s 11811160064 # 11GB to get bdev label at 10737418240
     ceph-bluestore-tool --path $dir/1 bluefs-bdev-expand || return 1
     truncate $dir/2/block -s 4295099392 # 4GB + 129KB
     ceph-bluestore-tool --path $dir/2 bluefs-bdev-expand || return 1