vendor and go mod. add ldap file

vendor/gopkg.in/asn1-ber.v1/content_int.go

@@ -0,0 +1,25 @@
+package ber
+
+func encodeUnsignedInteger(i uint64) []byte {
+	n := uint64Length(i)
+	out := make([]byte, n)
+
+	var j int
+	for ; n > 0; n-- {
+		out[j] = (byte(i >> uint((n-1)*8)))
+		j++
+	}
+
+	return out
+}
+
+func uint64Length(i uint64) (numBytes int) {
+	numBytes = 1
+
+	for i > 255 {
+		numBytes++
+		i >>= 8
+	}
+
+	return
+}