Add support for EC certificates (#2936)

[narrieta]

• Add support for EC certificates

• pylint

• pylint

• typo

---

Co-authored-by: narrieta
(cherry picked from commit 8bfad4d)

[codecov]

Codecov Report

Merging #2943 (bcd5635) into release-2.10.0.0 (279d557) will decrease coverage by 0.05%.
Report is 1 commits behind head on release-2.10.0.0.
The diff coverage is 60.71%.

@@                 Coverage Diff                  @@
##           release-2.10.0.0    #2943      +/-   ##
====================================================
- Coverage             72.01%   71.97%   -0.05%     
====================================================
  Files                   106      106              
  Lines                 16068    16084      +16     
  Branches               2305     2304       -1     
====================================================
+ Hits                  11572    11577       +5     
- Misses                 3962     3972      +10     
- Partials                534      535       +1     

Files	Coverage Δ
azurelinuxagent/common/event.py	85.45% <100.00%> (+0.03%)	⬆️
azurelinuxagent/common/protocol/goal_state.py	94.75% <100.00%> (-0.09%)	⬇️
...urelinuxagent/common/utils/extensionprocessutil.py	73.00% <ø> (ø)
azurelinuxagent/common/utils/cryptutil.py	45.53% <62.50%> (-0.26%)	⬇️
azurelinuxagent/ga/update.py	87.35% <55.55%> (-0.84%)	⬇️