update update.py

use python2 as intepreter
fork 'svn' command with en locale

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>
systrace: update to trace-viewer r202

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>
systrace: add block, ext4 event parser

port from android 4.1 tree

Signed-off-by: Young-Ho Cha <ganadist@gmail.com>