Change how kotlinc and tools display their version

- Display the Kotlin version in kotlin-gradle-plugin. This is needed
  because if "-version" is specified in compiler arguments, the "info"
  level of the message printed by the compiler in CLICompiler prevents
  it from being displayed by default (unless "--debug" is passed to
  Gradle).
- Display the version of JRE the compiler is running on. This will be
  helpful to diagnose Java 9 related issues in the future.
- In CLI, also display the executable name (kotlinc-jvm or kotlinc-js)

libraries/tools/kotlin-maven-plugin/src/main/java/org/jetbrains/kotlin/maven/KotlinCompileMojoBase.java

@@ -198,8 +198,8 @@ public abstract class KotlinCompileMojoBase<A extends CommonCompilerArguments> e
 
     @Override
     public void execute() throws MojoExecutionException, MojoFailureException {
-
-        getLog().info("Kotlin Compiler version " + KotlinCompilerVersion.VERSION);
+        getLog().info("Kotlin version " + KotlinCompilerVersion.VERSION +
+                " (JRE " + System.getProperty("java.runtime.version") + ")");
 
         if (!hasKotlinFilesInSources()) {
             getLog().warn("No sources found skipping Kotlin compile");