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
Merge branch 'dg/win_icon' into pu
Merge branch 'ao/fix_mnesia_block_table_exception' into pu
Merge branch 'sze/edlin_understand_keys' into pu
Merge branch 'sze/limit_max_length_int_shell' into pu
Merge branch 'yi/fix_eunit_io_protocol' into pu
Merge branch 'nox/igor-funs' into pu
Merge branch 'feat/erl_tidy_print_to_stdout' into pu
Merge branch 'epa/fix_io_noreturn_with_self_pid' into pu
Merge branch 'nox/fix-erl_lint-variable-usage' into pu
Merge branch 'ali/fix-inet-typespec' into pu
Merge branch 'mh/line-initial-commas' into pu
Merge branch 'lpg/openssh_zlib' into pu
Merge branch 'jw/fix-httpd-erl-script-nocache' into pu
Merge branch 'hm/reltool_script' into pu
Merge branch 'sg/odbcserver_crash_fix' into pu
Merge branch 'epa/add_fd_usage_in_rb' into pu
Merge branch 'nox/match-context-return' into pu