unittest_blkdev: delete unused test file

Signed-off-by: Leo Zhang <nguzcf@gmail.com>

diff --git a/src/test/common/test_blkdev_sys_block/sys/dev/block/8:0 b/src/test/common/test_blkdev_sys_block/sys/dev/block/8:0
deleted file mode 120000 (symlink)
index 5bf9d74..0000000
--- a/src/test/common/test_blkdev_sys_block/sys/dev/block/8:0
+++ /dev/null
@@ -1 +0,0 @@
-../../block/sda
\ No newline at end of file

diff --git a/src/test/common/test_blkdev_sys_block/sys/dev/block/9:0 b/src/test/common/test_blkdev_sys_block/sys/dev/block/9:0
deleted file mode 120000 (symlink)
index 65cbfc7..0000000
--- a/src/test/common/test_blkdev_sys_block/sys/dev/block/9:0
+++ /dev/null
@@ -1 +0,0 @@
-../../block/sdb
\ No newline at end of file