Change format of history items (#2560)

[narrieta]

• Change format of history directory

• Update message; fix typo

• py2 compat

• py2 compat

Co-authored-by: narrieta
(cherry picked from commit 93a2564)

[codecov]

Codecov Report

Merging #2565 (d40413f) into develop (d6678b4) will decrease coverage by 0.03%.
The diff coverage is 88.23%.

@@             Coverage Diff             @@
##           develop    #2565      +/-   ##
===========================================
- Coverage    71.90%   71.87%   -0.04%     
===========================================
  Files          102      102              
  Lines        15354    15358       +4     
  Branches      2436     2438       +2     
===========================================
- Hits         11041    11039       -2     
- Misses        3820     3826       +6     
  Partials       493      493              

Impacted Files	Coverage Δ
azurelinuxagent/common/utils/timeutil.py	61.53% <50.00%> (-27.36%)	⬇️
azurelinuxagent/common/protocol/goal_state.py	95.45% <100.00%> (+0.01%)	⬆️
azurelinuxagent/common/utils/archive.py	88.65% <100.00%> (-1.42%)	⬇️
azurelinuxagent/ga/update.py	89.27% <100.00%> (-0.02%)	⬇️

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