api: update capability map

etcdserver/api/capability.go

@@ -35,10 +35,9 @@ var (
 	// capabilityMaps is a static map of version to capability map.
 	// the base capabilities is the set of capability 2.0 supports.
 	capabilityMaps = map[string]map[Capability]bool{
-		"2.1.0": {AuthCapability: true},
-		"2.2.0": {AuthCapability: true},
 		"2.3.0": {AuthCapability: true},
 		"3.0.0": {AuthCapability: true, V3rpcCapability: true},
+		"3.1.0": {AuthCapability: true, V3rpcCapability: true},
 	}
 
 	enableMapMu sync.RWMutex