Moved current incremental compiler test data into subdirectory.

Tweaked test generator to avoid creating test methods for parent directory of tests.

jps-plugin/testData/incremental/pureKotlin/simpleClassDependency/Bar.kt

@@ -0,0 +1,2 @@
+package test
+class Bar

jps-plugin/testData/incremental/pureKotlin/simpleClassDependency/Foo.kt

@@ -0,0 +1,8 @@
+package test
+class Foo {
+    fun f() {
+        Bar()
+    }
+
+    class Boo
+}

jps-plugin/testData/incremental/pureKotlin/simpleClassDependency/Foo.kt.new

@@ -0,0 +1,8 @@
+package test
+class Foo {
+    fun f() {
+        Bar()
+    }
+
+    class Boo
+}

jps-plugin/testData/incremental/pureKotlin/simpleClassDependency/build.log

@@ -0,0 +1,7 @@
+Cleaning output files:
+out/production/module/test/Foo$Boo.class
+out/production/module/test/Foo.class
+End of files
+Compiling files:
+src/Foo.kt
+End of files