Python 3 fixes for the relax codebase.
These changes were made using the command: 2to3 -j 4 -w -f buffer -f idioms -f set_literal -f ws_comma -x except -x import -x imports -x long -x numliterals -x xrange .
Authored by: bugman 2014-11-10
Parent: [r26500]
Child: [r26502]
