Fix gen_opcodes.py for Python 2.4
Fix gen_opcodes.py for Python 2.4

Change-Id: I6e373c370f8081c1e549cbe4d1bc2a0a254ad357
Reviewed-on: http://gerrit.ent.cloudera.com:8080/622
Reviewed-by: Henry Robinson <3eca10f30041813f045165784e24b5a950a6cc7e@cloudera.com>
Tested-by: Skye Wanderman-Milne <6d4b168ab637b0a20cc9dbf96abb2537f372f946@cloudera.com>

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