Setup different fix alias on different sub projects and add support to ignore dedicated packages when do scalafix.

Because some sub projects does not enable the MultiNode plugin.

Add ignore packages support for scalafix.

project/ScalafixForMultiNodePlugin.scala

@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2018 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package akka
+
+import com.typesafe.sbt.MultiJvmPlugin
+import sbt.{AutoPlugin, Def, PluginTrigger, Plugins, ScalafixSupport, Setting, inConfig}
+import scalafix.sbt.ScalafixPlugin.autoImport.scalafixConfigSettings
+
+object ScalafixForMultiNodePlugin extends AutoPlugin with ScalafixSupport {
+  override def trigger: PluginTrigger = allRequirements
+
+  override def requires: Plugins = MultiNode
+
+  import MultiJvmPlugin.autoImport._
+
+  lazy val scalafixIgnoredSetting: Seq[Setting[_]] = Seq(
+    ignore(MultiJvm)
+  )
+
+  override def projectSettings: Seq[Def.Setting[_]] =
+    Seq(MultiJvm).flatMap(c => inConfig(c)(scalafixConfigSettings(c))) ++
+      scalafixIgnoredSetting ++ Seq(
+      updateProjectCommands(
+        alias = "fix",
+        value = ";scalafixEnable;compile:scalafix;test:scalafix;multi-jvm:scalafix;test:compile"))
+}