[Patch] Mechanism for board files to set default remotetimeout

[Sterling Augustine]

The enclosed simple patch adds and demonstrates a new mechanism for a
board file to declare a default remotetimeout. It follows a similar
mechanism as set height 0.

This is useful if the board has high latency for internal gdb
commands, as remote-stdio-gdbserver.exp does.

OK for trunk?

Sterling

2013-05-30  Sterling Augustine  <saugustine@google.com>

	* lib/gdb.exp (default_gdb_start): Use new global gdb_remotetimeout.
	* boards/remote-stdio-gdbserver.exp: Set global gdb_remotetimeout.
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