making Netty's EventLoopGroup shutdown's eager (#1255)

ledger/api-server-damlonx/src/main/scala/com/daml/ledger/api/server/damlonx/Server.scala

@@ -198,7 +198,9 @@ final class Server private (
     logger.info("Shutting down server...")
     server.shutdownNow()
     assume(server.awaitTermination(10, TimeUnit.SECONDS))
-    serverEventLoopGroup.shutdownGracefully().await(10L, TimeUnit.SECONDS)
+    serverEventLoopGroup
+      .shutdownGracefully(0, 0, TimeUnit.SECONDS)
+      .await(10, TimeUnit.SECONDS)
     serverEsf.close()
   }
 }

ledger/ledger-api-integration-tests/src/test/lib/scala/com/digitalasset/platform/apitesting/RemoteServerResource.scala

@@ -58,7 +58,9 @@ class RemoteServerResource(host: String, port: Int, tlsConfig: Option[TlsConfigu
   override def close(): Unit = {
     channel.shutdownNow()
     channel.awaitTermination(1L, TimeUnit.SECONDS)
-    eventLoopGroup.shutdownGracefully().await(1L, TimeUnit.SECONDS)
+    eventLoopGroup
+      .shutdownGracefully(0, 0, TimeUnit.SECONDS)
+      .await(10L, TimeUnit.SECONDS)
     channel = null
     eventLoopGroup = null
   }

ledger/ledger-api-integration-tests/src/test/lib/scala/com/digitalasset/platform/apitesting/SandboxServerResource.scala

@@ -52,7 +52,9 @@ class SandboxServerResource(sandboxConfig: SandboxConfig) extends Resource[Platf
   override def close(): Unit = {
     channel.shutdownNow()
     channel.awaitTermination(5L, TimeUnit.SECONDS)
-    eventLoopGroup.shutdownGracefully().await(10L, TimeUnit.SECONDS)
+    eventLoopGroup
+      .shutdownGracefully(0, 0, TimeUnit.SECONDS)
+      .await(10L, TimeUnit.SECONDS)
     sandboxServer.close()
     channel = null
     eventLoopGroup = null

ledger/sandbox/src/test/lib/scala/com/digitalasset/platform/sandbox/services/SandboxServerResource.scala

@@ -46,7 +46,9 @@ class SandboxServerResource(config: => SandboxConfig) extends Resource[Channel]
 
   override def close(): Unit = {
     channel.shutdownNow()
-    eventLoopGroup.shutdownGracefully().await(10L, TimeUnit.SECONDS)
+    eventLoopGroup
+      .shutdownGracefully(0, 0, TimeUnit.SECONDS)
+      .await(10L, TimeUnit.SECONDS)
     sandboxServer.close()
     channel = null
     eventLoopGroup = null