[MERGE][1.7] Fix '_in_buffer' AttributeError when using the -Dhpss debug flag.

[Andrew Bennetts]

Hi,

When bzrlib/smart/protocol.py was changed to reduce string concatenations for
1.6, one use of the old “_in_buffer” attribute of ProtocolThreeDecoder inside a
-Dhpss code path wasn't changed.

This trivial patch updates that spot, and for good measure removes a commented
out line of code that referenced that attribute too.  I checked for other uses
with grep, and didn't find any other uses.

This patch is very small and safe, and helps debugging with -Dhpss, so I think
it's worth cherry-picking into 1.7.

-Andrew.

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