Exposed visibility checking, a set of exposed visibility tests, some test fixes

Effective visibility mechanism introduced.
Local is considered as public, java protected as Kotlin protected, java package private as Kotlin private.

core/descriptor.loader.java/src/org/jetbrains/kotlin/load/java/JavaVisibilities.java

@@ -17,6 +17,7 @@
 package org.jetbrains.kotlin.load.java;
 
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 import org.jetbrains.kotlin.descriptors.*;
 import org.jetbrains.kotlin.resolve.DescriptorUtils;
 import org.jetbrains.kotlin.resolve.scopes.receivers.ReceiverValue;
@@ -54,6 +55,12 @@ public class JavaVisibilities {
         public Visibility normalize() {
             return Visibilities.PROTECTED;
         }
+
+        @NotNull
+        @Override
+        public EffectiveVisibility effectiveVisibility(@Nullable ClassDescriptor classDescriptor) {
+            return EffectiveVisibility.Companion.effectiveVisibility(Visibilities.PRIVATE, classDescriptor);
+        }
     };
 
     public static final Visibility PROTECTED_STATIC_VISIBILITY = new Visibility("protected_static", true) {