Refactor etcd into object and add exit timers

This refactors my etcd use into a struct (object) wrapper, which makes
it easier to add an exit on converged timer.

pgraph.go

@@ -95,7 +95,7 @@ func (g *Graph) SetName(name string) {
 	g.Name = name
 }
 
-func (g *Graph) State() graphState {
+func (g *Graph) GetState() graphState {
 	g.mutex.Lock()
 	defer g.mutex.Unlock()
 	return g.state
@@ -577,6 +577,12 @@ func (g *Graph) Exit() {
 	}
 }
 
+func (g *Graph) SetConvergedCallback(ctimeout int, converged chan bool) {
+	for v := range g.GetVerticesChan() {
+		v.Type.SetConvegedCallback(ctimeout, converged)
+	}
+}
+
 // in array function to test *vertices in a slice of *vertices
 func HasVertex(v *Vertex, haystack []*Vertex) bool {
 	for _, r := range haystack {