Fix tests for librdkafka 0.11.3+

[carsonip]

Limit queued.max.messages.kbytes according to librdkafka https://github.com/edenhill/librdkafka/commit/cc43f451b46e41fc3ce00e3b4e5c9bafd11f7b0e.

This will fix rdkafka tests on librdkafka 0.11.3+.

E       RdKafkaException: Configuration property "queued.max.messages.kbytes" value 102400000 is outside allowed range 1..2097151

[codecov-io]

Codecov Report

Merging #928 into master will increase coverage by 0.6%. The diff coverage is 100%.

@@            Coverage Diff            @@
##           master     #928     +/-   ##
=========================================
+ Coverage   83.21%   83.81%   +0.6%     
=========================================
  Files          36       36             
  Lines        3806     3807      +1     
  Branches      562      562             
=========================================
+ Hits         3167     3191     +24     
+ Misses        490      472     -18     
+ Partials      149      144      -5

Impacted Files	Coverage Δ
pykafka/rdkafka/simple_consumer.py	89.47% <100%> (+0.09%)	:arrow_up:
pykafka/handlers.py	91.17% <0%> (-1.48%)	:arrow_down:
pykafka/balancedconsumer.py	90.05% <0%> (+0.29%)	:arrow_up:
pykafka/broker.py	94.21% <0%> (+1.15%)	:arrow_up:
pykafka/topic.py	80.41% <0%> (+2.06%)	:arrow_up:
pykafka/cluster.py	73.62% <0%> (+2.19%)	:arrow_up:
pykafka/simpleconsumer.py	87.05% <0%> (+2.45%)	:arrow_up:
pykafka/connection.py	86.13% <0%> (+2.97%)	:arrow_up:

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