Rename jet -> kotlin in compiler-tests (except resolve)

Move test-related code to org.jetbrains.kotlin.test, also move some tests to
packages with better names

compiler/tests/org/jetbrains/kotlin/codegen/ControlStructuresTest.java

@@ -17,7 +17,7 @@
 package org.jetbrains.kotlin.codegen;
 
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.jet.ConfigurationKind;
+import org.jetbrains.kotlin.test.ConfigurationKind;
 
 import java.lang.reflect.Method;
 import java.util.Arrays;