remove save_resume/preserve_performance_counters options as it breaks…

[eisber]

… SGD/BFGS chaining

[eisber]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).

[codecov]

Codecov Report

Merging #828 into master will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #828      +/-   ##
==========================================
+ Coverage   85.32%   85.36%   +0.04%     
==========================================
  Files         186      186              
  Lines        8597     8597              
  Branches      507      503       -4     
==========================================
+ Hits         7335     7339       +4     
+ Misses       1262     1258       -4     

Impacted Files	Coverage Δ
...a/com/microsoft/ml/spark/vw/VowpalWabbitBase.scala	91.86% <100.00%> (+1.74%)	⬆️
.../execution/streaming/continuous/HTTPSourceV2.scala	93.04% <0.00%> (ø)
...om/microsoft/ml/spark/core/utils/ClusterUtil.scala	68.75% <0.00%> (+2.08%)	⬆️

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[mhamilton723]

/azp run

[azure-pipelines]

Azure Pipelines successfully started running 1 pipeline(s).