JetDiagnosticsTest migrated to TestGenerator

- test data files renamed from *.jet to *.kt

compiler/testData/diagnostics/tests/DelegationAndOverriding.kt

@@ -0,0 +1,38 @@
+//namespace override
+
+trait T {
+    fun foo()
+    val v : Int
+}
+
+open class <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>Br<!>(t : T) : T {
+
+}
+
+class <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>Br3<!>(t : T) : Br(t) {
+
+}
+
+open class Br1(t : T) : T by t {
+
+}
+
+class Br2(t : T) : Br1(t) {
+
+}
+
+trait G<T> {
+    fun foo(t : T) : T
+}
+
+class <!ABSTRACT_MEMBER_NOT_IMPLEMENTED!>GC<!>() : G<Int> {
+
+}
+
+open class GC1(g : G<Int>) : G<Int> by g {
+
+}
+
+open class GC2(g : G<Int>) : GC1(g) {
+
+}