Adds CompatibilityWarningOptions. Fixes #2347

This addresses 0.13.10 regression, which currently warns users about
Maven incompatibility on a private configuration. This adds a config
class so the build user can control the level of the warning as well as
the target configuration to be monitored.
By default, we are only going to look at `Compile` and `Runtime`.

librarymanagement/src/main/scala/sbt/internal/librarymanagement/CompatibilityWarning.scala

@@ -1,23 +1,48 @@
 package sbt.internal.librarymanagement
 
 import sbt.librarymanagement._
-import sbt.util.Logger
+import sbt.util.{ Level, Logger }
+
+import Configurations._
+
+final class CompatibilityWarningOptions private[sbt] (
+  val configurations: Seq[Configuration],
+  val level: Level.Value
+)
+
+object CompatibilityWarningOptions {
+  def default: CompatibilityWarningOptions =
+    apply(configurations = List(Compile, Runtime), level = Level.Warn)
+  def apply(
+    configurations: List[Configuration],
+    level: Level.Value
+  ): CompatibilityWarningOptions =
+    new CompatibilityWarningOptions(
+      configurations = configurations,
+      level = level
+    )
+}
 
 private[sbt] object CompatibilityWarning {
-  def apply(module: IvySbt#Module, mavenStyle: Boolean, log: Logger): Unit = {
+  def run(config: CompatibilityWarningOptions, module: IvySbt#Module, mavenStyle: Boolean, log: Logger): Unit = {
     if (mavenStyle) {
-      processIntransitive(module, log)
+      processIntransitive(config, module, log)
     }
   }
-
-  def processIntransitive(module: IvySbt#Module, log: Logger): Unit = {
+  def processIntransitive(config: CompatibilityWarningOptions, module: IvySbt#Module, log: Logger): Unit = {
+    val monitoredConfigsStr: Set[String] = (config.configurations map { _.name }).toSet
     val directDependencies: Seq[ModuleID] = module.moduleSettings match {
       case x: InlineConfiguration             => x.dependencies
       case x: InlineConfigurationWithExcludes => x.dependencies
       case _                                  => Seq()
     }
+    def inMonitoredConfigs(configOpt: Option[String]): Boolean =
+      configOpt match {
+        case Some(c) => (c.split(",").toSet intersect monitoredConfigsStr).nonEmpty
+        case None    => monitoredConfigsStr contains "compile"
+      }
     directDependencies foreach { m =>
-      if (!m.isTransitive) {
+      if (!m.isTransitive && inMonitoredConfigs(m.configurations)) {
         log.warn(
           s"""Found intransitive dependency ($m) while publishMavenStyle is true, but Maven repositories
              |  do not support intransitive dependencies. Use exclusions instead so transitive dependencies