Prepare release
[sasl] Remove directory with unicode characters after successful test

This is to avoid lingering files after test runs on windows, since the
cleanup script often does not succeed in removing files with unicode
characters.
Add Fd usage in rb logging

rb was only accepting physical filenames as log file.
This patch allow rb to accept now any io_device, valid registered name,
except standard_error which is replaced by standard_io.
Creation of two new exported functions : rb:log_list/0-1
that print in log file if existing, otherwise on standard_io.
Add new functions documentation and tests in rb_SUITE.
kernel: sasl: fixed rb.xml docs