replace dep with go modules (#16017)

- guide shamelessly stolen from prometheus/prometheus
- updates local interface of oauth exchange
- updates local impl of hclogger
- bump jaeger client version

closes #16088

vendor/github.com/gosimple/slug/.gitignore

@@ -0,0 +1,2 @@
+_*
+cover*.out

vendor/github.com/gosimple/slug/README.md

@@ -0,0 +1,58 @@
+slug
+====
+
+Package `slug` generate slug from unicode string, URL-friendly slugify with
+multiple languages support.
+
+[![GoDoc](https://godoc.org/github.com/gosimple/slug?status.png)](https://godoc.org/github.com/gosimple/slug)
+[![Build Status](https://travis-ci.com/gosimple/slug.svg?branch=master)](https://travis-ci.com/gosimple/slug)
+
+[Documentation online](http://godoc.org/github.com/gosimple/slug)
+
+## Example
+
+```go
+package main
+
+import (
+	"fmt"
+	"github.com/gosimple/slug"
+)
+
+func main() {
+	text := slug.Make("Hellö Wörld хелло ворлд")
+	fmt.Println(text) // Will print: "hello-world-khello-vorld"
+
+	someText := slug.Make("影師")
+	fmt.Println(someText) // Will print: "ying-shi"
+
+	enText := slug.MakeLang("This & that", "en")
+	fmt.Println(enText) // Will print: "this-and-that"
+
+	deText := slug.MakeLang("Diese & Dass", "de")
+	fmt.Println(deText) // Will print: "diese-und-dass"
+
+	slug.CustomSub = map[string]string{
+		"water": "sand",
+	}
+	textSub := slug.Make("water is hot")
+	fmt.Println(textSub) // Will print: "sand-is-hot"
+}
+
+```
+
+### Requests or bugs?
+<https://github.com/gosimple/slug/issues>
+
+## Installation
+```sh
+go get -u github.com/gosimple/slug
+```
+
+## License
+
+The source files are distributed under the
+[Mozilla Public License, version 2.0](http://mozilla.org/MPL/2.0/),
+unless otherwise noted.
+Please read the [FAQ](http://www.mozilla.org/MPL/2.0/FAQ.html)
+if you have further questions regarding the license.

vendor/github.com/gosimple/slug/languages_substitution.go

@@ -7,7 +7,9 @@ package slug
 
 func init() {
 	// Merge language subs with the default one
-	for _, sub := range []*map[rune]string{&deSub, &enSub, &plSub, &esSub} {
+	for _, sub := range []*map[rune]string{
+		&deSub, &enSub, &esSub, &fiSub, &grSub, &nlSub, &plSub,
+	} {
 		for key, value := range defaultSub {
 			(*sub)[key] = value
 		}
@@ -27,6 +29,12 @@ var defaultSub = map[rune]string{
 var deSub = map[rune]string{
 	'&': "und",
 	'@': "an",
+	'ä': "ae",
+	'Ä': "ae",
+	'ö': "oe",
+	'Ö': "oe",
+	'ü': "ue",
+	'Ü': "ue",
 }
 
 var enSub = map[rune]string{
@@ -34,16 +42,16 @@ var enSub = map[rune]string{
 	'@': "at",
 }
 
-var plSub = map[rune]string{
-	'&': "i",
-	'@': "na",
-}
-
 var esSub = map[rune]string{
 	'&': "y",
 	'@': "en",
 }
 
+var fiSub = map[rune]string{
+	'&': "ja",
+	'@': "at",
+}
+
 var grSub = map[rune]string{
 	'&': "kai",
 	'η': "i",
@@ -51,7 +59,22 @@ var grSub = map[rune]string{
 	'Η': "i",
 	'ι': "i",
 	'ί': "i",
+	'ϊ': "i",
 	'Ι': "i",
 	'χ': "x",
 	'Χ': "x",
+	'ω': "w",
+	'ώ': "w",
+	'Ω': "w",
+	'ϋ': "u",
+}
+
+var nlSub = map[rune]string{
+	'&': "en",
+	'@': "at",
+}
+
+var plSub = map[rune]string{
+	'&': "i",
+	'@': "na",
 }

vendor/github.com/gosimple/slug/slug.go

@@ -56,12 +56,16 @@ func MakeLang(s string, lang string) (slug string) {
 		slug = SubstituteRune(slug, deSub)
 	case "en":
 		slug = SubstituteRune(slug, enSub)
-	case "pl":
-		slug = SubstituteRune(slug, plSub)
 	case "es":
 		slug = SubstituteRune(slug, esSub)
+	case "fi":
+		slug = SubstituteRune(slug, fiSub)
 	case "gr":
 		slug = SubstituteRune(slug, grSub)
+	case "nl":
+		slug = SubstituteRune(slug, nlSub)
+	case "pl":
+		slug = SubstituteRune(slug, plSub)
 	default: // fallback to "en" if lang not found
 		slug = SubstituteRune(slug, enSub)
 	}
@@ -74,7 +78,7 @@ func MakeLang(s string, lang string) (slug string) {
 	// Process all remaining symbols
 	slug = regexpNonAuthorizedChars.ReplaceAllString(slug, "-")
 	slug = regexpMultipleDashes.ReplaceAllString(slug, "-")
-	slug = strings.Trim(slug, "-")
+	slug = strings.Trim(slug, "-_")
 
 	if MaxLength > 0 {
 		slug = smartTruncate(slug)