add exception handler in _get_master_addr_port since the port might b…

[majieyue]

What changes were proposed in this pull request?

add try-exception to protect _get_master_addr_port and add retry of the calling to relieve the port sync problem

Why are the changes needed?

the return value of _get_master_addr_port may be invalid

Does this PR introduce any user-facing change?

No

How was this patch tested?

UT

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 84.00000% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.37%. Comparing base (0ef290a) to head (b466f01). Report is 34 commits behind head on master.

Files with missing lines	Patch %	Lines
dlrover/python/elastic_agent/torch/training.py	55.55%	4 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1293      +/-   ##
==========================================
+ Coverage   80.34%   80.37%   +0.02%     
==========================================
  Files         222      222              
  Lines       20481    20525      +44     
==========================================
+ Hits        16456    16496      +40     
- Misses       4025     4029       +4     

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