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

store/store.go

@@ -34,6 +34,7 @@ type Store interface {
 	Post() PostStore
 	User() UserStore
 	Audit() AuditStore
+	ClusterDiscovery() ClusterDiscoveryStore
 	Compliance() ComplianceStore
 	Session() SessionStore
 	OAuth() OAuthStore
@@ -239,6 +240,15 @@ type AuditStore interface {
 	PermanentDeleteByUser(userId string) StoreChannel
 }
 
+type ClusterDiscoveryStore interface {
+	Save(discovery *model.ClusterDiscovery) StoreChannel
+	Delete(discovery *model.ClusterDiscovery) StoreChannel
+	Exists(discovery *model.ClusterDiscovery) StoreChannel
+	GetAll(discoveryType, clusterName string) StoreChannel
+	SetLastPingAt(discovery *model.ClusterDiscovery) StoreChannel
+	Cleanup() StoreChannel
+}
+
 type ComplianceStore interface {
 	Save(compliance *model.Compliance) StoreChannel
 	Update(compliance *model.Compliance) StoreChannel