Remove single + auto values for connect URI option

GODRIVER-665

Change-Id: Id18b90151d867283073020a19316d0ec3820ec0e

Author: dmhilly

x/network/connstring/connstring.go

@@ -486,8 +486,8 @@ func (p *parser) addOption(pair string) error {
 		p.Compressors = compressors
 	case "connect":
 		switch strings.ToLower(value) {
-		case "auto", "automatic":
-		case "direct", "single":
+		case "automatic":
+		case "direct":
 			p.Connect = SingleConnect
 		default:
 			return fmt.Errorf("invalid 'connect' value: %s", value)

x/network/connstring/connstring_test.go

@@ -98,10 +98,8 @@ func TestConnect(t *testing.T) {
 		expected connstring.ConnectMode
 		err      bool
 	}{
-		{s: "connect=auto", expected: connstring.AutoConnect},
 		{s: "connect=automatic", expected: connstring.AutoConnect},
-		{s: "connect=AUTO", expected: connstring.AutoConnect},
-		{s: "connect=single", expected: connstring.SingleConnect},
+		{s: "connect=AUTOMATIC", expected: connstring.AutoConnect},
 		{s: "connect=direct", expected: connstring.SingleConnect},
 		{s: "connect=blah", err: true},
 	}