Fix lb-method validation

* "least_time" and "last_byte" are no longer valid input
* Add the above as invalid input to unit test

Author: Dean-Coakley

internal/nginx/extensions.go

@@ -25,16 +25,14 @@ func ParseLBMethod(method string) (string, error) {
 }
 
 var nginxLBValidInput = map[string]bool{
-	"least_conn":                      true,
-	"ip_hash":                         true,
-	"random":                          true,
-	"random two":                      true,
-	"random two least_conn":           true,
+	"least_conn":            true,
+	"ip_hash":               true,
+	"random":                true,
+	"random two":            true,
+	"random two least_conn": true,
 }
 
 var nginxPlusLBValidInput = map[string]bool{
-	"least_time":                      true,
-	"last_byte":                       true,
 	"least_conn":                      true,
 	"ip_hash":                         true,
 	"random":                          true,

internal/nginx/extensions_test.go

@@ -72,6 +72,8 @@ func TestParseLBMethodForPlus(t *testing.T) {
 		"",
 		"blabla",
 		"hash123",
+		"least_time",
+		"last_byte",
 		"least_time inflight header",
 		"random one",
 		"random two ip_hash",