[ofa-general] [IBSIM] add ReLink command

[Al Chu]

Hey Sasha,

This adds a "ReLink" command to ibsim.  If a link was previously
unlinked, you can run "ReLink" to reconnect it to whatever it was
connected to before.  It's easier than having to figure out what it was
connected to previously and input both the local and remote ends under
the "Link" command.

The idea for this option came up when I was trying to simulate an entire
cluster going down then going back up.  Scripting the cluster to go down
was easy ("Unlink" all CAs), but scripting it to come back up was a
little harder since I had to figure out all the other end ports to input
into "Link".

Al

-- 
Albert Chu
chu11 at llnl.gov
925-422-5311
Computer Scientist
High Performance Systems Division
Lawrence Livermore National Laboratory
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