Comment and simplify a bit of conversion

There are ample opportunities to optimize and streamline here.  For example,
there's no reason to have a function to convert IntStr to IntStr. Removing the
function does generate the right assignment, but it is unclear whether the
registered function is needed or not.  I opted to leave it alone for now.
Another example is Convert_Slice_byte_To_Slice_byte, which just seems silly.

cmd/libs/go2idl/conversion-gen/generators/conversion.go

@@ -695,6 +695,11 @@ func (g *genConversion) doSlice(inType, outType *types.Type, sw *generator.Snipp
 				funcName := g.funcNameTmpl(inType.Elem, outType.Elem)
 				sw.Do(fmt.Sprintf("if err := %s(&(*in)[i], &(*out)[i], s); err != nil {\n", funcName), argsFromType(inType.Elem, outType.Elem))
 			} else {
+				// TODO: This triggers on v1.ObjectMeta <-> api.ObjectMeta and
+				// similar because neither package is the target package, and
+				// we really don't know which package will have the conversion
+				// function defined.  This fires on basically every object
+				// conversion outside of pkg/api/v1.
 				sw.Do("// TODO: Inefficient conversion - can we improve it?\n", nil)
 				sw.Do("if err := s.Convert(&(*in)[i], &(*out)[i], 0); err != nil {\n", nil)
 			}

pkg/api/conversion.go

@@ -100,15 +100,12 @@ func Convert_unversioned_TypeMeta_To_unversioned_TypeMeta(in, out *unversioned.T
 }
 
 func Convert_unversioned_ListMeta_To_unversioned_ListMeta(in, out *unversioned.ListMeta, s conversion.Scope) error {
-	out.ResourceVersion = in.ResourceVersion
-	out.SelfLink = in.SelfLink
+	*out = *in
 	return nil
 }
 
 func Convert_intstr_IntOrString_To_intstr_IntOrString(in, out *intstr.IntOrString, s conversion.Scope) error {
-	out.Type = in.Type
-	out.IntVal = in.IntVal
-	out.StrVal = in.StrVal
+	*out = *in
 	return nil
 }