PLT-6080 moving clustering to memberlist (#6499)

* PLT-6080 adding cluster discovery service

* Adding memberlist lib

* Adding memberlist lib

* WIP

* WIP

* WIP

* WIP

* Rolling back config changes

* Fixing make file

* Fixing config for cluster

* WIP

* Fixing system console for clustering

* Fixing default config

* Fixing config

* Fixing system console for clustering

* Tweaking hub setting

* Bumping up time

* merging vendor dir

* Updating vendor dir

* Fixing unit test

* Fixing bad merge

* Remove some testing code

* Moving comment

* PLT-6868 adding db ping retry

* Removing unused loc strings

* Adding defer to cancel

model/cluster_message_test.go

@@ -0,0 +1,28 @@
+// Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+package model
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestClusterMessage(t *testing.T) {
+	m := ClusterMessage{
+		Event:    CLUSTER_EVENT_PUBLISH,
+		SendType: CLUSTER_SEND_BEST_EFFORT,
+		Data:     "hello",
+	}
+	json := m.ToJson()
+	result := ClusterMessageFromJson(strings.NewReader(json))
+
+	if result.Data != "hello" {
+		t.Fatal()
+	}
+
+	badresult := ClusterMessageFromJson(strings.NewReader("junk"))
+	if badresult != nil {
+		t.Fatal("should not have parsed")
+	}
+}