Bulk Operation

FLINK-14105 Remove scala from plugin parent-first patterns

FLINK-14105 RestServerEndpoint references on netty 3

FLINK-14105 Bump Akka to 2.6

FLINK-14105 Add RpcSystem abstraction

FLINK-14105 Add flink-rpc-akka module

FLINK-14105 Add flink-rpc-core module

FLINK-14105 AddressResolution should be a top-level class

FLINK-14105 Consolidate FutureUtils to flink-core

FLINK-14105 Move ExecutorThreadFactory to flink-core

FLINK-14105 Isolate RpcConnectionTest from runtime implementations

FLINK-14105 Split AkkaRpcServiceUtils

FLINK-14105 Move Executors#directExecutorContext to AkkaFutureUtils

FLINK-14105 Split BootstrapTools

FLINK-14105 Move FutureUtils.toJava into separate class

FLINK-14105 Move chill dependency to flink-scala

FLINK-14105 Replace AkkaUtils#get*Timeout*

FLINK-14105 Move SSLUtils#is*Enabled to SecurityOptions

FLINK-14105 Use Optional in NettyBufferPool

FLINK-14105 Remove unused ScalaUtils/TestingMessages

FLINK-14105 Port Tasks to Java

FLINK-14105 Port TestingUtils to Java

FLINK-14105 Load AkkaRpcService through separate class loader

FLINK-14105 Remove unnecessary scala Duration usages in flink-runtime

FLINK-14105 Make TimeUtils able to parse duration string with plural form labels

FLINK-14105 Remove unused BootstrapTools#generateTaskManagerConfiguration

FLINK-14105 Use TimeUtils to parse duration configs

FLINK-14105 Enable TimeUtils to parse all time units labels supported by scala Duration