enable peer payload update

Signed-off-by: Evan Hazlett <ejhazlett@gmail.com>

agent.go

@@ -5,6 +5,7 @@ import (
 	"sync"
 	"time"
 
+	"github.com/gogo/protobuf/types"
 	"github.com/hashicorp/memberlist"
 )
 
@@ -66,6 +67,11 @@ func (a *Agent) SyncInterval() time.Duration {
 	return a.memberConfig.PushPullInterval
 }
 
+// Update updates the agent payload
+func (a *Agent) Update(payload *types.Any) {
+	a.state.Self.Payload = payload
+}
+
 func newSubscribers() *subscribers {
 	return &subscribers{
 		subs: make(map[chan *NodeEvent]struct{}),