python - fe: Stop using the Ignition message and Fix B&Es performance

Log Message:
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Stop using the Ignition message and Fix B&Es performance issue.

Fix the BindingsAndExecutings performance failures by making the message buffer
large enough for all the B&E messages that would be returned by a transaction
call. This makes the message writer write all 21 or so messages in one write as
opposed to three (10 Bs, 10 Es, and one Flush)

Update tests accordingly.

Modified Files:
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    fe/src:
        tracenull.py (r1.6 -> r1.7)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/fe/src/tracenull.py.diff?r1=1.6&r2=1.7)
    fe/test:
        qio.py (r1.1.1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/fe/test/qio.py.diff?r1=1.1.1.1&r2=1.2)
        tracenull.py (r1.1.1.1 -> r1.2)
        (http://cvs.pgfoundry.org/cgi-bin/cvsweb.cgi/python/fe/test/tracenull.py.diff?r1=1.1.1.1&r2=1.2)