add vendor packages避免用户网络太慢无法下载编译

vendor/github.com/eapache/go-xerial-snappy/.gitignore

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+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.test
+*.prof

vendor/github.com/eapache/go-xerial-snappy/.travis.yml

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+language: go
+
+go:
+- 1.5.4
+- 1.6.1
+
+sudo: false

vendor/github.com/eapache/go-xerial-snappy/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Evan Huus
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/eapache/go-xerial-snappy/README.md

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+# go-xerial-snappy
+
+[![Build Status](https://travis-ci.org/eapache/go-xerial-snappy.svg?branch=master)](https://travis-ci.org/eapache/go-xerial-snappy)
+
+Xerial-compatible Snappy framing support for golang.
+
+Packages using Xerial for snappy encoding use a framing format incompatible with
+basically everything else in existence. This package wraps Go's built-in snappy
+package to support it.
+
+Apps that use this format include Apache Kafka (see
+https://github.com/dpkp/kafka-python/issues/126#issuecomment-35478921 for
+details).

vendor/github.com/eapache/go-xerial-snappy/snappy.go

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+package snappy
+
+import (
+	"bytes"
+	"encoding/binary"
+
+	master "github.com/golang/snappy"
+)
+
+var xerialHeader = []byte{130, 83, 78, 65, 80, 80, 89, 0}
+
+// Encode encodes data as snappy with no framing header.
+func Encode(src []byte) []byte {
+	return master.Encode(nil, src)
+}
+
+// Decode decodes snappy data whether it is traditional unframed
+// or includes the xerial framing format.
+func Decode(src []byte) ([]byte, error) {
+	if !bytes.Equal(src[:8], xerialHeader) {
+		return master.Decode(nil, src)
+	}
+
+	var (
+		pos   = uint32(16)
+		max   = uint32(len(src))
+		dst   = make([]byte, 0, len(src))
+		chunk []byte
+		err   error
+	)
+	for pos < max {
+		size := binary.BigEndian.Uint32(src[pos : pos+4])
+		pos += 4
+
+		chunk, err = master.Decode(chunk, src[pos:pos+size])
+		if err != nil {
+			return nil, err
+		}
+		pos += size
+		dst = append(dst, chunk...)
+	}
+	return dst, nil
+}