Fixes wrong already running/loaded messages.

If you have a hyve, say gl-old, and wish to install (or perhaps start)  a hyve,
gl, you'll get an erroneous message:

	This guest appears to be already running/loaded.
	Use stop, destroy, or forcekill to remove zombie processes.

This fixes that.

lib/ioh-guest

@@ -319,7 +319,7 @@ __guest_load() {
 		*) local wire_memory="" ;;
 	esac
 	# Check for loader already present as a zombie
-	if [ ! -z $(pgrep -f "ioh-$name") ]; then
+	if [ ! -z $(pgrep -xf "ioh-$name") ]; then
 		echo "This guest appears to be already running/loaded."
 		echo "Use stop, destroy, or forcekill to remove zombie processes."
 		exit 1