update influxdb to v1.1.1 and change client to v2

vendor/github.com/influxdata/influxdb/pkg/escape/bytes.go

@@ -1,6 +1,9 @@
 package escape
 
-import "bytes"
+import (
+	"bytes"
+	"strings"
+)
 
 func Bytes(in []byte) []byte {
 	for b, esc := range Codes {
@@ -9,7 +12,54 @@ func Bytes(in []byte) []byte {
 	return in
 }
 
+const escapeChars = `," =`
+
+func IsEscaped(b []byte) bool {
+	for len(b) > 0 {
+		i := bytes.IndexByte(b, '\\')
+		if i < 0 {
+			return false
+		}
+
+		if i+1 < len(b) && strings.IndexByte(escapeChars, b[i+1]) >= 0 {
+			return true
+		}
+		b = b[i+1:]
+	}
+	return false
+}
+
+func AppendUnescaped(dst, src []byte) []byte {
+	var pos int
+	for len(src) > 0 {
+		next := bytes.IndexByte(src[pos:], '\\')
+		if next < 0 || pos+next+1 >= len(src) {
+			return append(dst, src...)
+		}
+
+		if pos+next+1 < len(src) && strings.IndexByte(escapeChars, src[pos+next+1]) >= 0 {
+			if pos+next > 0 {
+				dst = append(dst, src[:pos+next]...)
+			}
+			src = src[pos+next+1:]
+			pos = 0
+		} else {
+			pos += next + 1
+		}
+	}
+
+	return dst
+}
+
 func Unescape(in []byte) []byte {
+	if len(in) == 0 {
+		return nil
+	}
+
+	if bytes.IndexByte(in, '\\') == -1 {
+		return in
+	}
+
 	i := 0
 	inLen := len(in)
 	var out []byte