[#noissue] Remove internal LongAdder for jdk7 compatibility

[emeroad]

No description provided.

[codecov]

Codecov Report

Merging #8950 (05941e1) into master (2e1f5cf) will increase coverage by 0.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #8950      +/-   ##
============================================
+ Coverage     40.05%   40.07%   +0.01%     
- Complexity    11674    11676       +2     
============================================
  Files          3259     3259              
  Lines         89436    89436              
  Branches       9939     9939              
============================================
+ Hits          35825    35839      +14     
+ Misses        50555    50544      -11     
+ Partials       3056     3053       -3     

Impacted Files	Coverage Δ
...rc/main/java/com/navercorp/pinpoint/test/Item.java	72.22% <0.00%> (-3.71%)	⬇️
...tor/metric/datasource/DefaultDataSourceMetric.java	85.18% <0.00%> (-3.71%)	⬇️
...om/navercorp/pinpoint/rpc/codec/PacketDecoder.java	51.66% <0.00%> (-1.67%)	⬇️
...point/rpc/client/DefaultPinpointClientHandler.java	70.42% <0.00%> (-1.41%)	⬇️
...pinpoint/profiler/monitor/DeadlockMonitorTask.java	21.59% <0.00%> (+1.13%)	⬆️
...java/com/navercorp/pinpoint/rpc/DefaultFuture.java	76.14% <0.00%> (+1.83%)	⬆️
.../navercorp/pinpoint/rpc/client/RequestManager.java	74.24% <0.00%> (+7.57%)	⬆️
...m/navercorp/pinpoint/rpc/client/ConnectFuture.java	79.16% <0.00%> (+8.33%)	⬆️
...r/context/storage/AsyncQueueingUriStatStorage.java	85.29% <0.00%> (+11.76%)	⬆️
...p/pinpoint/rpc/stream/StreamChannelRepository.java	78.94% <0.00%> (+21.05%)	⬆️

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