Prompting user to run tail with -F instead of -f

This way, when you run configure with tail if the directory and file for logging don't exist because it hasn't had time to create them yet, it will retry after they are created. This was mentioned in  #944

Specifically, this happens: 

```bash
bash-4.3$ ./openbazaar start; tail -f logs/production.log
tail: cannot open 'logs/production.log' for reading: No such file or directory
```