Commits on Oct 7, 2021

1. (torch/elastic) add fqdn hostname to error printout (pytorch#66182) …

   Summary:
   Pull Request resolved: pytorch#66182
   
   closes pytorch#63174
   
   Does a few things:
   
   1. adds hostname to the error report
   2. moves the "root cause" section to the end (presumably since the logs are being "tailed" we want the root cause to appear at the end)
   3. moves redundant error info logging to debug
   4. makes the border max 60 char in length and justifies left for the header
   
   NOTE: YOU HAVE TO annotate your main function with torch.distributed.elastic.multiprocessing.errors.record, otherwise no traceback is printed (this is because python exception propagation does NOT work out of the both for IPC - hence the extra record annotation).
   
   Test Plan:
   Sample
   
   ```
   ============================================================
   run_script_path FAILED
   ------------------------------------------------------------
   Failures:
     <NO_OTHER_FAILURES>
   ------------------------------------------------------------
   Root Cause (first observed failure):
   [0]:
     time      : 2021-10-05_17:37:22
     host      : devvm4955.prn0.facebook.com
     rank      : 0 (local_rank: 0)
     exitcode  : 1 (pid: 3296201)
     error_file: /home/kiuk/tmp/elastic/none_3_lsytqe/attempt_0/0/error.json
     traceback :
     Traceback (most recent call last):
       File "/tmp/jetter.xr3_x6qq/torch/distributed/elastic/multiprocessing/errors/__init__.py", line 372, in wrapper
         return f(*args, **kwargs)
       File "main.py", line 28, in main
         raise RuntimeError(args.throws)
     RuntimeError: foobar
   
   ============================================================
   ```
   
   Reviewed By: cbalioglu, aivanou
   
   Differential Revision: D31416492
   
   fbshipit-source-id: 7490e1a90b8083fd38329f321cc09ab8b8713b26

   

   Kiuk Chung authored and facebook-github-bot committed Oct 7, 2021
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