Fix parameter types and return types

[sazzad16]

Resolves #2374
Resolves #2394

[dengliming]

Looks great.

[codecov-io]

Codecov Report

Merging #2396 (bb90095) into master (786f7dc) will decrease coverage by 0.30%.
The diff coverage is 27.39%.

@@             Coverage Diff              @@
##             master    #2396      +/-   ##
============================================
- Coverage     59.06%   58.76%   -0.31%     
- Complexity     2132     2137       +5     
============================================
  Files            97      104       +7     
  Lines          9996    10059      +63     
  Branches        477      477              
============================================
+ Hits           5904     5911       +7     
- Misses         3897     3953      +56     
  Partials        195      195              

Impacted Files	Coverage Δ	Complexity Δ
...n/java/redis/clients/jedis/BinaryJedisCluster.java	10.96% <0.00%> (-0.05%)	31.00 <0.00> (ø)
...n/java/redis/clients/jedis/BinaryShardedJedis.java	6.53% <0.00%> (-0.10%)	8.00 <0.00> (ø)
src/main/java/redis/clients/jedis/Client.java	91.57% <ø> (ø)	273.00 <0.00> (ø)
src/main/java/redis/clients/jedis/Jedis.java	92.43% <ø> (ø)	312.00 <0.00> (ø)
...rc/main/java/redis/clients/jedis/JedisCluster.java	6.69% <ø> (ø)	21.00 <0.00> (ø)
...rc/main/java/redis/clients/jedis/PipelineBase.java	12.01% <0.00%> (-0.04%)	43.00 <0.00> (ø)
...rc/main/java/redis/clients/jedis/ShardedJedis.java	11.85% <ø> (ø)	17.00 <0.00> (ø)
...nts/jedis/commands/BinaryJedisClusterCommands.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...is/clients/jedis/commands/BinaryRedisPipeline.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
...in/java/redis/clients/jedis/commands/Commands.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
... and 16 more

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