Increase max request size for HAProxy to be comparable to cloud LBs
Increase max request size for HAProxy to be comparable to cloud LBs

Real world applications have larger request headers and URLs than the
HAProxy default of 8kb. Double the total buffer size and reserve more
for the request buffer.  This brings the default ootb router closer to
existing cloud LBs which have bigger buffer sizes.

This will increase peak memory use of highly contended servers, but is
more realistic than breaking normal applications.

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