Refactor: libpacemaker: Use pcmk__formatted_printf.

I'm going to convert out->info to take is_quiet into account, which
means we need another way to print some of these messages to the screen.
We can't use pcmk__indented_printf because that will take list
indentation into account and out->info previously just printed to the
beginning of the line. Luckily, I can use these new printing functions
instead.