[SPARK-19810][BUILD][CORE] Remove support for Scala 2.10
## What changes were proposed in this pull request? - Remove Scala 2.10 build profiles and support - Replace some 2.10 support in scripts with commented placeholders for 2.12 later - Remove deprecated API calls from 2.10 support - Remove usages of deprecated context bounds where possible - Remove Scala 2.10 workarounds like ScalaReflectionLock - Other minor Scala warning fixes ## How was this patch tested? Existing tests Author: Sean Owen <sowen@cloudera.com> Closes #17150 from srowen/SPARK-19810.
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- R/pkg/R/sparkR.R 2 additions, 2 deletionsR/pkg/R/sparkR.R
- R/pkg/tests/fulltests/test_client.R 2 additions, 2 deletionsR/pkg/tests/fulltests/test_client.R
- bin/load-spark-env.cmd 11 additions, 11 deletionsbin/load-spark-env.cmd
- bin/load-spark-env.sh 11 additions, 11 deletionsbin/load-spark-env.sh
- build/mvn 3 additions, 3 deletionsbuild/mvn
- core/src/main/scala/org/apache/spark/Accumulable.scala 2 additions, 1 deletioncore/src/main/scala/org/apache/spark/Accumulable.scala
- core/src/main/scala/org/apache/spark/SparkContext.scala 4 additions, 11 deletionscore/src/main/scala/org/apache/spark/SparkContext.scala
- core/src/main/scala/org/apache/spark/rdd/SequenceFileRDDFunctions.scala 11 additions, 43 deletions...scala/org/apache/spark/rdd/SequenceFileRDDFunctions.scala
- core/src/main/scala/org/apache/spark/rpc/RpcTimeout.scala 2 additions, 2 deletionscore/src/main/scala/org/apache/spark/rpc/RpcTimeout.scala
- core/src/main/scala/org/apache/spark/ui/JettyUtils.scala 3 additions, 3 deletionscore/src/main/scala/org/apache/spark/ui/JettyUtils.scala
- core/src/main/scala/org/apache/spark/util/logging/FileAppender.scala 4 additions, 4 deletions...in/scala/org/apache/spark/util/logging/FileAppender.scala
- core/src/test/scala/org/apache/spark/FileSuite.scala 2 additions, 2 deletionscore/src/test/scala/org/apache/spark/FileSuite.scala
- core/src/test/scala/org/apache/spark/deploy/SparkSubmitUtilsSuite.scala 3 additions, 3 deletions...scala/org/apache/spark/deploy/SparkSubmitUtilsSuite.scala
- core/src/test/scala/org/apache/spark/deploy/master/MasterSuite.scala 2 additions, 1 deletion...st/scala/org/apache/spark/deploy/master/MasterSuite.scala
- core/src/test/scala/org/apache/spark/executor/ExecutorSuite.scala 1 addition, 0 deletions.../test/scala/org/apache/spark/executor/ExecutorSuite.scala
- core/src/test/scala/org/apache/spark/rdd/LocalCheckpointSuite.scala 1 addition, 0 deletions...est/scala/org/apache/spark/rdd/LocalCheckpointSuite.scala
- core/src/test/scala/org/apache/spark/scheduler/OutputCommitCoordinatorSuite.scala 1 addition, 1 deletion...apache/spark/scheduler/OutputCommitCoordinatorSuite.scala
- core/src/test/scala/org/apache/spark/scheduler/SparkListenerSuite.scala 1 addition, 1 deletion...scala/org/apache/spark/scheduler/SparkListenerSuite.scala
- core/src/test/scala/org/apache/spark/scheduler/TaskSetBlacklistSuite.scala 2 additions, 2 deletions...la/org/apache/spark/scheduler/TaskSetBlacklistSuite.scala
- core/src/test/scala/org/apache/spark/serializer/KryoSerializerSuite.scala 2 additions, 2 deletions...ala/org/apache/spark/serializer/KryoSerializerSuite.scala
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