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/datastructure.go

@@ -166,7 +166,7 @@ const NoValue = "--"
 func init() {
 	// Check that nodes.conf is found
 	if !util.IsFile(ConfigFile) {
-		wwlog.Warn("Missing node configuration file\n")
+		wwlog.Warn("Missing node configuration file")
 		// just return silently, as init is also called for bash_completion
 		return
 	}