Replace all instances of wwlog.Printf

wwlog provides named loggers for each level, which requires
less code and is clearer than wwlog.Printf. The code has
included a mix of both, but this commit consolidates existing
code on the per-level functions.

Signed-off-by: Jonathon Anderson <janderson@ciq.co>

internal/app/wwctl/profile/list/main.go

@@ -14,13 +14,13 @@ func CobraRunE(cmd *cobra.Command, args []string) error {
 
 	nodeDB, err := node.New()
 	if err != nil {
-		wwlog.Printf(wwlog.ERROR, "Could not open node configuration: %s\n", err)
+		wwlog.Error("Could not open node configuration: %s\n", err)
 		os.Exit(1)
 	}
 
 	profiles, err := nodeDB.FindAllProfiles()
 	if err != nil {
-		wwlog.Printf(wwlog.ERROR, "Could not find all nodes: %s\n", err)
+		wwlog.Error("Could not find all nodes: %s\n", err)
 		os.Exit(1)
 	}