Upgrade to netty 4.1.51.Final and netty-tcnative 2.0.33.Final

[odidev]

• Upgrade to netty 4.1.50.Final and netty-tcnative 2.0.31.Final for both security fixes and AArch64 performance improvements
• Refer release notes for detail: https://netty.io/news/2020/05/13/4-1-50-Final.html
• Added very minor tolerance in a value comparison in a test case file LossyEmaTest.scala to make it compatible with aarch64.

Signed-off-by: odidev odidev@puresoftware.com

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Merging #870 into develop will decrease coverage by 0.03%. The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop     #870      +/-   ##
===========================================
- Coverage    78.22%   78.19%   -0.04%     
===========================================
  Files          817      818       +1     
  Lines        24180    24237      +57     
  Branches      1579     1519      -60     
===========================================
+ Hits         18916    18951      +35     
- Misses        5264     5286      +22     

Impacted Files	Coverage Δ
...tter/finagle/dispatch/SerialClientDispatcher.scala	83.33% <0.00%> (-16.67%)	:arrow_down:
.../com/twitter/finagle/tracing/BroadcastTracer.scala	60.41% <0.00%> (-6.25%)	:arrow_down:
...rtitioning/ConsistentHashPartitioningService.scala	95.00% <0.00%> (-5.00%)	:arrow_down:
...riftmux/service/ClientTraceAnnotationsFilter.scala	91.66% <0.00%> (-4.17%)	:arrow_down:
...m/twitter/finagle/exp/ConcurrencyLimitFilter.scala	88.57% <0.00%> (-2.86%)	:arrow_down:
...src/main/scala/com/twitter/finagle/Memcached.scala	76.52% <0.00%> (-2.76%)	:arrow_down:
...ft/src/main/scala/com/twitter/finagle/Thrift.scala	86.46% <0.00%> (-2.69%)	:arrow_down:
...src/main/scala/com/twitter/finagle/ThriftMux.scala	86.41% <0.00%> (-2.41%)	:arrow_down:
...gle/http2/transport/client/RefCountedFactory.scala	78.26% <0.00%> (-2.18%)	:arrow_down:
...http/src/main/scala/com/twitter/finagle/Http.scala	84.47% <0.00%> (-2.16%)	:arrow_down:
... and 15 more

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[bryce-anderson]

This generally looks reasonable, but why did you not choose to upgrade to netty 4.1.51.Final, which has been available since early July?

[bryce-anderson]

Merged as c4eb5bafd20295ed6f2bfc70ffd7e0e981437f14. Thanks!