qemu-iotests: remove commented out variables

The variables FULL_MKFS_OPTIONS and FULL_MOUNT_OPTIONS are commented
out, never used, and even refer to functions that do exist.  The last
time these were touched was around 8 years ago, so I guess it's safe
to assume outputting such information on test execution is still on the
radar.

Signed-off-by: Cleber Rosa <crosa@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>

tests/qemu-iotests/check

@@ -229,8 +229,6 @@ rm -f check.full
 
 FULL_IMGFMT_DETAILS=`_full_imgfmt_details`
 FULL_HOST_DETAILS=`_full_platform_details`
-#FULL_MKFS_OPTIONS=`_scratch_mkfs_options`
-#FULL_MOUNT_OPTIONS=`_scratch_mount_options`
 
 cat <<EOF
 QEMU          -- "$QEMU_PROG" $QEMU_OPTIONS
@@ -244,8 +242,6 @@ TEST_DIR      -- $TEST_DIR
 SOCKET_SCM_HELPER -- $SOCKET_SCM_HELPER
 
 EOF
-#MKFS_OPTIONS  -- $FULL_MKFS_OPTIONS
-#MOUNT_OPTIONS -- $FULL_MOUNT_OPTIONS
 
 seq="check"