fix #1641: [EC2] Add missing "creation_date" NodeImage extra

[mazerty]

[EC2] Add missing "creation_date" NodeImage extra

Description

Fixes #1641.
Also tested "live" with modified 3.4.1 code in a virtualenv and listing real images.

Status

• done, ready for review

Checklist

• Code linting (required, can be done after the PR checks)
• Documentation
• Tests
• ICLA (required for bigger changes)

[Kami]

Thanks for the contribution. LGTM.

[codecov-commenter]

Codecov Report

Merging #1642 (8be3308) into trunk (90971e1) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##            trunk    #1642   +/-   ##
=======================================
  Coverage   83.17%   83.17%           
=======================================
  Files         398      398           
  Lines       86709    86712    +3     
  Branches     9217     9217           
=======================================
+ Hits        72120    72123    +3     
  Misses      11453    11453           
  Partials     3136     3136           

Impacted Files	Coverage Δ
libcloud/compute/drivers/ec2.py	75.49% <ø> (ø)
libcloud/test/compute/test_ec2.py	97.89% <100.00%> (+<0.01%)	⬆️

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