Add retry to check_sudo_status and unit test

[feng-j678]

[x] add retry logic into check_sudo_status that check sudo for 30 mins at interval of 5min (300sec)
[x] add MAX_CHECK_SUDO_RETRY_COUNT, MAX_CHECK_SUDO_INTERVAL_IN_SEC in constant
[x] add add unit test in test_coremain file to test all possible check sudo cases

[codecov]

Codecov Report

Attention: Patch coverage is 98.94737% with 1 line in your changes missing coverage. Please review.

Project coverage is 92.23%. Comparing base (530dec2) to head (ba5660a).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/core/tests/Test_Bootstrapper.py	98.14%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #278      +/-   ##
==========================================
+ Coverage   92.09%   92.23%   +0.14%     
==========================================
  Files          91       92       +1     
  Lines       15953    16035      +82     
==========================================
+ Hits        14692    14790      +98     
+ Misses       1261     1245      -16     

Flag	Coverage Δ
python27	92.23% <98.94%> (+0.14%)	⬆️
python39	92.23% <98.94%> (+0.14%)	⬆️

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[kjohn-msft]

Comments inline

[rane-rajasi]

Comments inline

[kjohn-msft]

Please review original comments again

[rane-rajasi]

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