gdbserver server testing docs, and mention --disable-packet in gdbserver/README,

[Pedro Alves]

Hi,

 --disable-packet was just added to gdbserver.  This is a developer
only  feature, to emulate testing against stubs that don't support
optional features.  A complement to disabling packets on the GDB side.

Since it isn't a switch intended for the user to use, it's not reported
with gdbserver --help.  This makes it described nowhere but the code, and
as we, know, an undocumented feature, si almost as good as no feature, so,
I wanted to add a small blurb about it somewhere.  gdbserver's README
file seemed like a good place, if you already know what you're looking
for.  The internal manual in the testing section looks like the right
place to put testing related documentation.  Then, I figured that
we might as well describe how to do a testsuite run against a local
GDBserver.  But, by doing that, I'd have to either inline a board file
in the manual, point at the wiki page containing it, or import the
board file into the code base.  I chose the later.  What do you think
about it?  Daniel, I think this is your board file.  If you're
willing to put it in the sources, shall it have a license/copyright
notice?

What do you think about it?  And what about the rest of the patch?
Is it useful to have?

-- 
Pedro Alves
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