added missing spaces in log msgs of graph cmd (#166)

* added missing spaces in log msgs

* removed "!"

clab/graph.go

@@ -13,7 +13,7 @@ var g *gographviz.Graph
 
 // GenerateGraph generates a graph of the lab topology
 func (c *cLab) GenerateGraph(topo string) error {
-	log.Info("Generating lab graph ...")
+	log.Info("Generating lab graph...")
 	g = gographviz.NewGraph()
 	if err := g.SetName(c.TopoFile.name); err != nil {
 		return err
@@ -72,7 +72,7 @@ func (c *cLab) GenerateGraph(topo string) error {
 	// create graph filename
 	dotfile := c.Dir.LabGraph + "/" + c.TopoFile.name + ".dot"
 	createFile(dotfile, g.String())
-	log.Info("Created", dotfile, "!")
+	log.Infof("Created %s", dotfile)
 
 	pngfile := c.Dir.LabGraph + "/" + c.TopoFile.name + ".png"
 
@@ -81,7 +81,6 @@ func (c *cLab) GenerateGraph(topo string) error {
 		generatePngFromDot(dotfile, pngfile)
 		log.Info("Created ", pngfile)
 	}
-	log.Info("Done generating lab graph!")
 	return nil
 }