Remove trailing newline from wwlog

I noticed that some wwlog calls included a trailing newline, but others
did not. I tested both in isolation and discovered that the behavior was
consistent regardless of whether a trailing newline was included. I
further confirmed in code that wwlog appends a trailing newline
automatically if it is not present; so a trailing newline is unnecessary
in individual calls.

This commit removes trailing newlines from all calls to make them
consistent. It also replaces two calls to wwlog.Printf. (see #534)

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

internal/pkg/node/methods.go

@@ -60,7 +60,7 @@ func (ent *Entry) Set(val string) {
 	}
 
 	if val == "UNDEF" || val == "DELETE" || val == "UNSET" || val == "--" || val == "nil" {
-		wwlog.Debug("Removing value for %v\n", *ent)
+		wwlog.Debug("Removing value for %v", *ent)
 		ent.value = []string{""}
 	} else {
 		ent.value = []string{val}