(trunk) Fix issue when the lines wouldn't be random enough. WARNING: this...

(trunk) Fix issue when the lines wouldn't be random enough. WARNING: this patch will cause shuffle_list.pl working in different way, i.e. it will produce differently shuffled lines! 

git-svn-id: https://svn.code.sf.net/p/kaldi/code/trunk@5153 5e6a8d80-dfce-4ca6-a32a-6e07a63d50c8