all: Become a Go module (fixes #5148) (#5384)

* go mod init; rm -rf vendor

* tweak proto files and generation

* go mod vendor

* clean up build.go

* protobuf literals in tests

* downgrade gogo/protobuf

vendor/github.com/oschwald/maxminddb-golang/.gitignore

@@ -0,0 +1,4 @@
+.vscode
+*.out
+*.sw?
+*.test

vendor/github.com/oschwald/maxminddb-golang/.gitmodules

@@ -0,0 +1,3 @@
+[submodule "test-data"]
+	path = test-data
+	url = https://github.com/maxmind/MaxMind-DB.git

vendor/github.com/oschwald/maxminddb-golang/.travis.yml

@@ -0,0 +1,23 @@
+language: go
+
+go:
+ - 1.4
+ - 1.5
+ - 1.6
+ - 1.7
+ - 1.8
+ - tip
+
+before_install:
+  - "if [[ $TRAVIS_GO_VERSION == 1.7 ]]; then go get -v github.com/golang/lint/golint; fi"
+
+install:
+  - go get -v -t ./...
+
+script:
+  - go test -race -cpu 1,4 -v
+  - go test -race -v -tags appengine
+  - "if [[ $TRAVIS_GO_VERSION == 1.7 ]]; then go vet ./...; fi"
+  - "if [[ $TRAVIS_GO_VERSION == 1.7 ]]; then golint .; fi"
+
+sudo: false

vendor/github.com/oschwald/maxminddb-golang/README.md

@@ -0,0 +1,38 @@
+# MaxMind DB Reader for Go #
+
+[![Build Status](https://travis-ci.org/oschwald/maxminddb-golang.png?branch=master)](https://travis-ci.org/oschwald/maxminddb-golang)
+[![Windows Build Status](https://ci.appveyor.com/api/projects/status/4j2f9oep8nnfrmov/branch/master?svg=true)](https://ci.appveyor.com/project/oschwald/maxminddb-golang/branch/master)
+[![GoDoc](https://godoc.org/github.com/oschwald/maxminddb-golang?status.png)](https://godoc.org/github.com/oschwald/maxminddb-golang)
+
+This is a Go reader for the MaxMind DB format. Although this can be used to
+read [GeoLite2](http://dev.maxmind.com/geoip/geoip2/geolite2/) and
+[GeoIP2](https://www.maxmind.com/en/geoip2-databases) databases,
+[geoip2](https://github.com/oschwald/geoip2-golang) provides a higher-level
+API for doing so.
+
+This is not an official MaxMind API.
+
+## Installation ##
+
+```
+go get github.com/oschwald/maxminddb-golang
+```
+
+## Usage ##
+
+[See GoDoc](http://godoc.org/github.com/oschwald/maxminddb-golang) for
+documentation and examples.
+
+## Examples ##
+
+See [GoDoc](http://godoc.org/github.com/oschwald/maxminddb-golang) or
+`example_test.go` for examples.
+
+## Contributing ##
+
+Contributions welcome! Please fork the repository and open a pull request
+with your changes.
+
+## License ##
+
+This is free software, licensed under the ISC License.

vendor/github.com/oschwald/maxminddb-golang/appveyor.yml

@@ -0,0 +1,19 @@
+version: "{build}"
+
+os: Windows Server 2012 R2
+
+clone_folder: c:\gopath\src\github.com\oschwald\maxminddb-golang
+
+environment:
+  GOPATH: c:\gopath
+
+install:
+  - echo %PATH%
+  - echo %GOPATH%
+  - git submodule update --init --recursive
+  - go version
+  - go env
+  - go get -v -t ./...
+
+build_script:
+  - go test -v ./...