making --status the default

[Ben Elliston]

Earlier this year, there was a discussion about the understated
--status option.  This option causes runtest to exit with an exit code
of 1 ("failure" to the shell) if an error is encountered in any of the
Tcl scripts. The thread starts here:

  http://lists.gnu.org/archive/html/dejagnu/2016-01/msg00000.html

I would like to make --status the default so that runtest always exits
with an exit status of 2 if an error is encountered by Tcl.  This
seems like sensible behaviour and enables users to respond differently
from their Makefiles, build systems, etc.

I plan to leave the option there for backward compatibility, but it
would not do anything.

Thoughts?

Cheers, Ben

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