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/Unknwon/com/.gitignore

@@ -0,0 +1,24 @@
+# Compiled Object files, Static and Dynamic libs (Shared Objects)
+*.o
+*.a
+*.so
+
+# Folders
+_obj
+_test
+.idea
+
+# Architecture specific extensions/prefixes
+*.[568vq]
+[568vq].out
+
+*.cgo1.go
+*.cgo2.c
+_cgo_defun.c
+_cgo_gotypes.go
+_cgo_export.*
+
+_testmain.go
+
+*.exe
+*.iml

vendor/github.com/Unknwon/com/.travis.yml

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+language: go
+
+go:
+  - 1.2
+  - 1.3
+  - 1.4
+  - tip
+
+install: go get -v -t
+
+notifications:
+  email:
+    - u@gogs.io

vendor/github.com/Unknwon/com/README.md

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+Common Functions
+================
+
+[![Build Status](https://travis-ci.org/Unknwon/com.svg)](https://travis-ci.org/Unknwon/com) [![Go Walker](http://gowalker.org/api/v1/badge)](http://gowalker.org/github.com/Unknwon/com)
+
+This is an open source project for commonly used functions for the Go programming language.
+
+This package need >= **go 1.2**
+
+Code Convention: based on [Go Code Convention](https://github.com/Unknwon/go-code-convention).
+
+## Contribute
+
+Your contribute is welcome, but you have to check following steps after you added some functions and commit them:
+
+1. Make sure you wrote user-friendly comments for **all functions** .
+2. Make sure you wrote test cases with any possible condition for **all functions** in file `*_test.go`.
+3. Make sure you wrote benchmarks for **all functions** in file `*_test.go`.
+4. Make sure you wrote useful examples for **all functions** in file `example_test.go`.
+5. Make sure you ran `go test` and got **PASS** .