update lpe to 1.6.56

[feng-j678]

[x] Add retry to check_sudo_status and unit test #278
[x] Matching 20% increase in throttling limit at VM Agent #277
[x] address the stringio getvalue not found error in ut #275
[x] Apt debstyle882 support, bug-fixes in cache evaluation & manipulation #273
[x] Expanding support for yum install --assumeno cmd to include yum4 #272
[x] Pr1/increase_RebootManager_and_PatchAssessor_code coverage #267
[x] Bugfix/disable rhel8+ security plugin #266
[x] add unit testing to increase code coverage #265
[x] Fix broken 3-byte-unicode-related unit test in Python 2.x #264
[x] Matching log-source tagging for diagnosability with previous apt changes #282

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 92.22%. Comparing base (28a7647) to head (2c7081e).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #281   +/-   ##
=======================================
  Coverage   92.22%   92.22%           
=======================================
  Files          92       92           
  Lines       16017    16017           
=======================================
  Hits        14772    14772           
  Misses       1245     1245           

Flag	Coverage Δ
python27	92.22% <100.00%> (ø)
python39	92.22% <100.00%> (ø)

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