Updating dependencies. (#11680)

vendor/github.com/go-ldap/ldap/.travis.yml

@@ -1,7 +1,6 @@
 sudo: false
 language: go
 go:
-    - "1.4.x"
     - "1.5.x"
     - "1.6.x"
     - "1.7.x"

vendor/github.com/go-ldap/ldap/control.go

@@ -63,7 +63,9 @@ func (c *ControlString) Encode() *ber.Packet {
 	if c.Criticality {
 		packet.AppendChild(ber.NewBoolean(ber.ClassUniversal, ber.TypePrimitive, ber.TagBoolean, c.Criticality, "Criticality"))
 	}
-	packet.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, string(c.ControlValue), "Control Value"))
+	if c.ControlValue != "" {
+		packet.AppendChild(ber.NewString(ber.ClassUniversal, ber.TypePrimitive, ber.TagOctetString, string(c.ControlValue), "Control Value"))
+	}
 	return packet
 }