pgraph: Remove use of Flags struct in favour of Value API

One small step to completely cleaning up the pgraph package so that we
can eventually fix the code that would otherwise create a cycle!

pgraph/autoedge.go

@@ -23,6 +23,7 @@ import (
 	"log"
 
 	"github.com/purpleidea/mgmt/resources"
+	"github.com/purpleidea/mgmt/util"
 )
 
 // add edges to the vertex in a graph based on if it matches a uid list
@@ -38,7 +39,7 @@ func (g *Graph) addEdgesByMatchingUIDS(v *Vertex, uids []resources.ResUID) []boo
 			if v == vv { // skip self
 				continue
 			}
-			if g.Flags.Debug {
+			if b, ok := g.Value("debug"); ok && util.Bool(b) {
 				log.Printf("Compile: AutoEdge: Match: %s[%s] with UID: %s[%s]", vv.GetKind(), vv.GetName(), uid.GetKind(), uid.GetName())
 			}
 			// we must match to an effective UID for the resource,
@@ -84,7 +85,7 @@ func (g *Graph) AutoEdges() {
 				log.Printf("%s[%s]: Config: The auto edge list is empty!", v.GetKind(), v.GetName())
 				break // inner loop
 			}
-			if g.Flags.Debug {
+			if b, ok := g.Value("debug"); ok && util.Bool(b) {
 				log.Println("Compile: AutoEdge: UIDS:")
 				for i, u := range uids {
 					log.Printf("Compile: AutoEdge: UID%d: %v", i, u)