common: filter more messages from _scratch_mkfs_ext4

common: filter more messages from _scratch_mkfs_ext4

Commit a94334afa2ff ("common: filter warning messages from mkfs.ext4")
filtered warning messages from mke2fs stderr output but missed the
mke2fs version infomation message, and generic/135 still fails because
of this

  QA output created by 135
 +mke2fs 1.42.9 (28-Dec-2013)
  0000000 1212 1212 1212 1212 1212 1212 1212 1212

So also filter out this message in _scratch_mkfs_ext4.

Reported-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>