add private method __getHost for setup default port to 9092

[morgangt]

i am fixed how could #870 this my version realization
if it's ok i resume commits if there is remarks I'll correct

[codecov-io]

Codecov Report

Merging #948 into master will increase coverage by 0.04%.
The diff coverage is 10.00%.

@@            Coverage Diff             @@
##           master     #948      +/-   ##
==========================================
+ Coverage   83.50%   83.54%   +0.04%     
==========================================
  Files          36       36              
  Lines        3807     3817      +10     
  Branches      562      565       +3     
==========================================
+ Hits         3179     3189      +10     
  Misses        483      483              
  Partials      145      145              

Impacted Files	Coverage Δ
pykafka/client.py	66.66% <10.00%> (-21.80%)	⬇️
pykafka/connection.py	85.14% <0.00%> (-1.99%)	⬇️
pykafka/simpleconsumer.py	85.49% <0.00%> (-0.90%)	⬇️
pykafka/cluster.py	72.26% <0.00%> (+0.72%)	⬆️
pykafka/balancedconsumer.py	90.93% <0.00%> (+1.75%)	⬆️
pykafka/managedbalancedconsumer.py	86.75% <0.00%> (+2.64%)	⬆️
pykafka/topic.py	82.47% <0.00%> (+3.09%)	⬆️

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