JetDiagnosticsTest migrated to TestGenerator

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

compiler/testData/diagnostics/tests/j+k/packageVisibility.kt

@@ -0,0 +1,24 @@
+//FILE: a/MyJavaClass.java
+package a;
+
+class MyJavaClass {
+}
+
+//FILE:a.kt
+package a
+
+val mc = MyJavaClass()
+
+//FILE: b.kt
+package b
+
+import a.<!INVISIBLE_REFERENCE!>MyJavaClass<!>
+
+val mc1 = <!INVISIBLE_MEMBER!>MyJavaClass<!>()
+
+//FILE: c.kt
+package a.c
+
+import a.<!INVISIBLE_REFERENCE!>MyJavaClass<!>
+
+val mc1 = <!INVISIBLE_MEMBER!>MyJavaClass<!>()