EC2: Generate longer resource IDs

[viren-nadkarni]

Since July 2018, AWS uses longer 17 character resource IDs for EC2.

See:

• https://www.amazonaws.cn/en/ec2/faqs/
• https://aws.amazon.com/about-aws/whats-new/2018/02/longer-format-resource-ids-are-now-available-in-amazon-ec2/
• https://aws.amazon.com/blogs/compute/longer-resource-ids-in-2018-for-amazon-ec2-amazon-ebs-and-amazon-vpc/

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.58%. Comparing base (1b21804) to head (3c399a9).
Report is 46 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8338      +/-   ##
==========================================
+ Coverage   94.56%   94.58%   +0.01%     
==========================================
  Files        1158     1159       +1     
  Lines      100579   101037     +458     
==========================================
+ Hits        95109    95561     +452     
- Misses       5470     5476       +6     

Flag	Coverage Δ
servertests	28.90% <92.85%> (+0.03%)	⬆️
unittests	94.55% <100.00%> (+0.01%)	⬆️

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