JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/scopes/kt151.kt

@@ -0,0 +1,40 @@
+//KT-151 Inherit visibility when overriding
+package kt151
+
+open class A {
+    protected open fun x() {}
+}
+
+class B : A() {
+    override fun x() {} // No visibility modifier required
+}
+
+fun test(b: B) {
+    b.<!INVISIBLE_MEMBER!>x<!>()
+}
+
+
+//more tests
+open class C {
+    internal open fun foo() {}
+}
+
+trait T {
+    protected fun foo() {}
+}
+
+class D : C(), T {
+    <!CANNOT_CHANGE_ACCESS_PRIVILEGE!>protected<!> override fun foo() {}
+}
+
+class E : C(), T {
+    <!CANNOT_CHANGE_ACCESS_PRIVILEGE!>internal<!> override fun foo() {}
+}
+
+class F : C(), T {
+    <!CANNOT_WEAKEN_ACCESS_PRIVILEGE!>private<!> override fun foo() {}
+}
+
+class G : C(), T {
+    public override fun foo() {}
+}