bug(tiller): sort unknown but different kinds alphabetically based on kind name

Adds additional manifest sorting logic so that different unknown kinds
are sorted alphabetically so that manifest order is more deterministic.

pkg/tiller/kind_sorter.go

@@ -116,8 +116,12 @@ func (k *kindSorter) Less(i, j int) bool {
 	b := k.manifests[j]
 	first, aok := k.ordering[a.Head.Kind]
 	second, bok := k.ordering[b.Head.Kind]
+	// if same kind (including unknown) sub sort alphanumeric
 	if first == second {
-		// same kind (including unknown) so sub sort alphanumeric
+		// if both are unknown and of different kind sort by kind alphabetically
+		if !aok && !bok && a.Head.Kind != b.Head.Kind {
+			return a.Head.Kind < b.Head.Kind
+		}
 		return a.Name < b.Name
 	}
 	// unknown kind is last

pkg/tiller/kind_sorter_test.go

@@ -175,7 +175,7 @@ func TestKindSorterSubSort(t *testing.T) {
 			Head: &util.SimpleHead{Kind: "ClusterRoleBinding"},
 		},
 		{
-			Name: "u3",
+			Name: "u2",
 			Head: &util.SimpleHead{Kind: "Unknown"},
 		},
 		{
@@ -183,8 +183,8 @@ func TestKindSorterSubSort(t *testing.T) {
 			Head: &util.SimpleHead{Kind: "Unknown"},
 		},
 		{
-			Name: "u2",
-			Head: &util.SimpleHead{Kind: "Unknown"},
+			Name: "t3",
+			Head: &util.SimpleHead{Kind: "Unknown2"},
 		},
 	}
 	for _, test := range []struct {
@@ -193,7 +193,7 @@ func TestKindSorterSubSort(t *testing.T) {
 		expected    string
 	}{
 		// expectation is sorted by kind (unknown is last) and then sub sorted alphabetically within each group
-		{"cm,clusterRole,clusterRoleBinding,Unknown", InstallOrder, "01Aa!zu1u2u3"},
+		{"cm,clusterRole,clusterRoleBinding,Unknown,Unknown2", InstallOrder, "01Aa!zu1u2t3"},
 	} {
 		var buf bytes.Buffer
 		t.Run(test.description, func(t *testing.T) {