runtimevar/etcdvar: Bring back runtimevar/etcdvar

[vangent]

Fixes #2914.

[codecov]

Codecov Report

Merging #3157 (a72108f) into master (8cd5286) will increase coverage by 0.13%.
The diff coverage is n/a.

❗ Current head a72108f differs from pull request most recent head e8053bf. Consider uploading reports for the commit e8053bf to get more accurate results

@@            Coverage Diff             @@
##           master    #3157      +/-   ##
==========================================
+ Coverage   72.45%   72.59%   +0.13%     
==========================================
  Files         112      113       +1     
  Lines       14287    14407     +120     
==========================================
+ Hits        10352    10459     +107     
- Misses       3223     3230       +7     
- Partials      712      718       +6     

Impacted Files	Coverage Δ
runtimevar/etcdvar/etcdvar.go	88.33% <ø> (ø)
runtimevar/awsparamstore/awsparamstore.go	89.02% <0.00%> (+0.60%)	⬆️

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