add overwrite method KafkaClient.getKafkaConsumer()

[liuzx32]

Description
Add an overwrite method getKafkaConsumer() for KafkaClient.

Improvement
Add method getKafkaConsumer() with the default properties from KafkaConsumerProperties.
The class KafkaConsumerProperties can load kafka config from conf/kylin-kafka-consumer.xml.

[asfgit]

Can one of the admins verify this patch?

[liuzx32]

Can one of the admins verify this patch?

Yes, admins can check it.

[codecov-io]

Codecov Report

Merging #650 into master will increase coverage by 0.1%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             master    #650     +/-   ##
==========================================
+ Coverage      25.7%   25.8%   +0.1%     
- Complexity     5976    6008     +32     
==========================================
  Files          1382    1382             
  Lines         82144   82146      +2     
  Branches      11509   11509             
==========================================
+ Hits          21112   21198     +86     
+ Misses        58985   58897     -88     
- Partials       2047    2051      +4

Impacted Files	Coverage Δ	Complexity Δ
...rg/apache/kylin/source/kafka/util/KafkaClient.java	0% <0%> (ø)	0 <0> (ø)	⬇️
...rg/apache/kylin/cube/inmemcubing/MemDiskStore.java	69.3% <0%> (-0.92%)	7% <0%> (ø)
...a/org/apache/kylin/dict/Number2BytesConverter.java	82.53% <0%> (+0.79%)	18% <0%> (+1%)	⬆️
.../apache/kylin/cube/cuboid/TreeCuboidScheduler.java	66.15% <0%> (+2.3%)	0% <0%> (ø)	⬇️
...rg/apache/kylin/storage/hybrid/HybridInstance.java	44.27% <0%> (+6.1%)	17% <0%> (+4%)	⬆️
.../java/org/apache/kylin/storage/StorageContext.java	30.1% <0%> (+30.1%)	10% <0%> (+10%)	⬆️
...kylin/storage/translate/FuzzyValueCombination.java	94.23% <0%> (+94.23%)	17% <0%> (+17%)	⬆️

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