mw/autopath: integration test with erratic (#930)

Add integration test with erratic. For this erratic now also returns an
autopath searchpath. This tests the whole chain; i.e registring a
searchfunction and calling that from autopath.

This tests does a autopathing domain and a non-autopathing one.

middleware/autopath/autopath_test.go

@@ -158,7 +158,7 @@ func TestInSearchPath(t *testing.T) {
 		{"a.b.svc.cluster.local.", false},
 	}
 	for i, tc := range tests {
-		got := a.FirstInSearchPath(tc.qname)
+		got := firstInSearchPath(tc.qname, a.search)
 		if got != tc.b {
 			t.Errorf("Test %d, got %v, expected %v", i, got, tc.b)
 		}