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/github.com/facebookgo/httpdown/.travis.yml

@@ -0,0 +1,23 @@
+language: go
+
+go:
+  - 1.6
+
+before_install:
+  - go get -v golang.org/x/tools/cmd/vet
+  - go get -v golang.org/x/tools/cmd/cover
+  - go get -v github.com/golang/lint/golint
+
+install:
+  - go install -race -v std
+  - go get -race -t -v ./...
+  - go install -race -v ./...
+
+script:
+  - go vet ./...
+  - $HOME/gopath/bin/golint .
+  - go test -cpu=2 -race -v ./...
+  - go test -cpu=2 -covermode=atomic -coverprofile=coverage.txt ./
+
+after_success:
+  - bash <(curl -s https://codecov.io/bash)

vendor/github.com/facebookgo/httpdown/readme.md

@@ -0,0 +1,41 @@
+httpdown [![Build Status](https://secure.travis-ci.org/facebookgo/httpdown.png)](https://travis-ci.org/facebookgo/httpdown)
+========
+
+Documentation: https://godoc.org/github.com/facebookgo/httpdown
+
+Package httpdown provides a library that makes it easy to build a HTTP server
+that can be shutdown gracefully (that is, without dropping any connections).
+
+If you want graceful restart and not just graceful shutdown, look at the
+[grace](https://github.com/facebookgo/grace) package which uses this package
+underneath but also provides graceful restart.
+
+Usage
+-----
+
+Demo HTTP Server with graceful termination:
+https://github.com/facebookgo/httpdown/blob/master/httpdown_example/main.go
+
+1. Install the demo application
+
+        go get github.com/facebookgo/httpdown/httpdown_example
+
+1. Start it in the first terminal
+
+        httpdown_example
+
+   This will output something like:
+
+        2014/11/18 21:57:50 serving on http://127.0.0.1:8080/ with pid 17
+
+1. In a second terminal start a slow HTTP request
+
+        curl 'http://localhost:8080/?duration=20s'
+
+1. In a third terminal trigger a graceful shutdown (using the pid from your output):
+
+        kill -TERM 17
+
+This will demonstrate that the slow request was served before the server was
+shutdown. You could also have used `Ctrl-C` instead of `kill` as the example
+application triggers graceful shutdown on TERM or INT signals.