pushed: [RFA(7.8)+NEWS] Remove "set/show remotebaud" (deprecated) commands.

[Joel Brobecker]

> gdb/ChangeLog:
> 
>         * serial.c (_initialize_serial): Remove support for
>         the "set remotebaud" and "show remotebaud" commands.
>         * NEWS: Add entry documenting the removal of that command.
> 
> gdb/testsuite/ChangeLog:
> 
>         * config/monitor.exp (gdb_target_monitor): Replace use of
>         "set remotebaud" by "set serial baud".

Pushed! Thanks, Eli, for your review of the NEWS part.

-- 
Joel