Use Go1.11 module (#5743)

* Migrate to go modules

* make vendor

* Update mvdan.cc/xurls

* make vendor

* Update code.gitea.io/git

* make fmt-check

* Update github.com/go-sql-driver/mysql

* make vendor

vendor/gopkg.in/src-d/go-billy.v4/.gitignore

@@ -0,0 +1,5 @@
+/coverage.txt
+/vendor
+Gopkg.lock
+Gopkg.toml
+go.sum

vendor/gopkg.in/src-d/go-billy.v4/.travis.yml

@@ -0,0 +1,16 @@
+language: go
+
+go:
+  - 1.9.x
+  - 1.10.x
+
+go_import_path: gopkg.in/src-d/go-billy.v4
+
+install:
+  - go get -v -t ./...
+
+script:
+  - make test-coverage
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

vendor/gopkg.in/src-d/go-billy.v4/DCO

@@ -0,0 +1,25 @@
+    Developer's Certificate of Origin 1.1
+
+    By making a contribution to this project, I certify that:
+
+    (a) The contribution was created in whole or in part by me and I
+        have the right to submit it under the open source license
+        indicated in the file; or
+
+    (b) The contribution is based upon previous work that, to the best
+        of my knowledge, is covered under an appropriate open source
+        license and I have the right under that license to submit that
+        work with modifications, whether created in whole or in part
+        by me, under the same open source license (unless I am
+        permitted to submit under a different license), as indicated
+        in the file; or
+
+    (c) The contribution was provided directly to me by some other
+        person who certified (a), (b) or (c) and I have not modified
+        it.
+
+    (d) I understand and agree that this project and the contribution
+	are public and that a record of the contribution (including all
+	personal information I submit with it, including my sign-off) is
+	maintained indefinitely and may be redistributed consistent with
+	this project or the open source license(s) involved.

vendor/gopkg.in/src-d/go-billy.v4/MAINTAINERS

@@ -0,0 +1 @@
+Máximo Cuadros <mcuadros@gmail.com> (@mcuadros)

vendor/gopkg.in/src-d/go-billy.v4/Makefile

@@ -0,0 +1,25 @@
+# General
+WORKDIR = $(PWD)
+
+# Go parameters
+GOCMD = go
+GOTEST = $(GOCMD) test -v
+
+# Coverage
+COVERAGE_REPORT = coverage.txt
+COVERAGE_PROFILE = profile.out
+COVERAGE_MODE = atomic
+
+test-coverage:
+	cd $(WORKDIR); \
+	echo "" > $(COVERAGE_REPORT); \
+	for dir in `find . -name "*.go" | grep -o '.*/' | sort | uniq`; do \
+		$(GOTEST) $$dir -coverprofile=$(COVERAGE_PROFILE) -covermode=$(COVERAGE_MODE); \
+		if [ $$? != 0 ]; then \
+			exit 2; \
+		fi; \
+		if [ -f $(COVERAGE_PROFILE) ]; then \
+			cat $(COVERAGE_PROFILE) >> $(COVERAGE_REPORT); \
+			rm $(COVERAGE_PROFILE); \
+		fi; \
+	done; \

vendor/gopkg.in/src-d/go-billy.v4/README.md

@@ -0,0 +1,72 @@
+# go-billy [![GoDoc](https://godoc.org/gopkg.in/src-d/go-billy.v4?status.svg)](https://godoc.org/gopkg.in/src-d/go-billy.v4) [![Build Status](https://travis-ci.org/src-d/go-billy.svg)](https://travis-ci.org/src-d/go-billy) [![Build status](https://ci.appveyor.com/api/projects/status/vx2qn6vlakbi724t?svg=true)](https://ci.appveyor.com/project/mcuadros/go-billy) [![codecov](https://codecov.io/gh/src-d/go-billy/branch/master/graph/badge.svg)](https://codecov.io/gh/src-d/go-billy)
+
+The missing interface filesystem abstraction for Go.
+Billy implements an interface based on the `os` standard library, allowing to develop applications without dependency on the underlying storage. Makes it virtually free to implement mocks and testing over filesystem operations.
+
+Billy was born as part of [src-d/go-git](https://github.com/src-d/go-git) project.
+
+## Installation
+
+```go
+go get -u gopkg.in/src-d/go-billy.v4/...
+```
+
+## Usage
+
+Billy exposes filesystems using the
+[`Filesystem` interface](https://godoc.org/github.com/src-d/go-billy#Filesystem).
+Each filesystem implementation gives you a `New` method, whose arguments depend on
+the implementation itself, that returns a new `Filesystem`.
+
+The following example caches in memory all readable files in a directory from any
+billy's filesystem implementation.
+
+```go
+func LoadToMemory(origin billy.Filesystem, path string) (*memory.Memory, error) {
+	memory := memory.New()
+
+	files, err := origin.ReadDir("/")
+	if err != nil {
+		return nil, err
+	}
+
+	for _, file := range files {
+		if file.IsDir() {
+			continue
+		}
+
+		src, err := origin.Open(file.Name())
+		if err != nil {
+			return nil, err
+		}
+
+		dst, err := memory.Create(file.Name())
+		if err != nil {
+			return nil, err
+		}
+
+		if _, err = io.Copy(dst, src); err != nil {
+			return nil, err
+		}
+
+		if err := dst.Close(); err != nil {
+			return nil, err
+		}
+
+		if err := src.Close(); err != nil {
+			return nil, err
+		}
+	}
+
+	return memory, nil
+}
+```
+
+## Why billy?
+
+The library billy deals with storage systems and Billy is the name of a well-known, IKEA
+bookcase. That's it.
+
+## License
+
+Apache License Version 2.0, see [LICENSE](LICENSE)

vendor/gopkg.in/src-d/go-billy.v4/appveyor.yml

@@ -0,0 +1,15 @@
+version: "{build}"
+platform: x64
+
+clone_folder: c:\gopath\src\gopkg.in\src-d\go-billy.v4
+
+environment:
+  GOPATH: c:\gopath
+
+install:
+  - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+  - go version
+  - go get -v -t ./...
+
+build_script:
+  - go test -v ./...

vendor/gopkg.in/src-d/go-billy.v4/go.mod

@@ -0,0 +1,7 @@
+module gopkg.in/src-d/go-billy.v4
+
+require (
+	github.com/kr/pretty v0.1.0 // indirect
+	golang.org/x/sys v0.0.0-20180903190138-2b024373dcd9
+	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127
+)

vendor/gopkg.in/src-d/go-billy.v4/go.sum

@@ -0,0 +1,9 @@
+github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+golang.org/x/sys v0.0.0-20180903190138-2b024373dcd9 h1:lkiLiLBHGoH3XnqSLUIaBsilGMUjI+Uy2Xu2JLUtTas=
+golang.org/x/sys v0.0.0-20180903190138-2b024373dcd9/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
+gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=