Close OkHttpClient when closing InfluxDBImpl

[asashour]

Fixes #359 and #286.

For the test, we can either expose the client as package protected for the test classes, or we use reflection by the Test method.

The test case uses the second mechanism.

[codecov-io]

Codecov Report

Merging #571 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #571      +/-   ##
============================================
+ Coverage     88.16%   88.18%   +0.01%     
  Complexity      703      703              
============================================
  Files            68       68              
  Lines          2392     2396       +4     
  Branches        247      247              
============================================
+ Hits           2109     2113       +4     
  Misses          198      198              
  Partials         85       85

Impacted Files	Coverage Δ	Complexity Δ
src/main/java/org/influxdb/impl/InfluxDBImpl.java	90.55% <100%> (+0.09%)	87 <0> (ø)	⬇️

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[majst01]

Great catch, thanks