Add config loader from stream

compiler/frontend/src/org/jetbrains/kotlin/script/KotlinScriptConfigurationManager.kt

@@ -33,6 +33,7 @@ import org.jetbrains.kotlin.parsing.KotlinParserDefinition
 import org.jetbrains.kotlin.psi.KtScript
 import org.jetbrains.kotlin.types.KotlinType
 import java.io.File
+import java.io.InputStream
 import java.io.StringWriter
 import java.util.*
 
@@ -60,6 +61,14 @@ fun loadScriptDefinitionsFromConfig(configFile: File): List<KotlinConfigurableSc
             }
         }
 
+@Suppress("unused") // Used externally
+fun loadScriptDefinitionsFromConfig(configStream: InputStream): List<KotlinConfigurableScriptDefinition> =
+        JDOMUtil.loadDocument(configStream).rootElement.children.mapNotNull {
+            XmlSerializer.deserialize(it, KotlinScriptConfig::class.java)?.let {
+                KotlinConfigurableScriptDefinition(it)
+            }
+        }
+
 @Suppress("unused")
 fun generateSampleScriptConfig(): String {