Adding ability to serve TLS directly from Mattermost server (#4119)

vendor/github.com/tylerb/graceful/tests/main.go

@@ -0,0 +1,40 @@
+package main
+
+import (
+	"fmt"
+	"sync"
+
+	"github.com/urfave/negroni"
+	"gopkg.in/tylerb/graceful.v1"
+)
+
+func main() {
+
+	var wg sync.WaitGroup
+
+	wg.Add(3)
+	go func() {
+		n := negroni.New()
+		fmt.Println("Launching server on :3000")
+		graceful.Run(":3000", 0, n)
+		fmt.Println("Terminated server on :3000")
+		wg.Done()
+	}()
+	go func() {
+		n := negroni.New()
+		fmt.Println("Launching server on :3001")
+		graceful.Run(":3001", 0, n)
+		fmt.Println("Terminated server on :3001")
+		wg.Done()
+	}()
+	go func() {
+		n := negroni.New()
+		fmt.Println("Launching server on :3002")
+		graceful.Run(":3002", 0, n)
+		fmt.Println("Terminated server on :3002")
+		wg.Done()
+	}()
+	fmt.Println("Press ctrl+c. All servers should terminate.")
+	wg.Wait()
+
+}