[util] Escape path separators in batch variable keys

[draker94]

No description provided.

[valfirst]

we can't hardcode it here:

1. util module should know nothing about engine module
2. this adds tight coupling to property naming

please check this: c9197ca

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.70%. Comparing base (d708d84) to head (5317cad).
Report is 30 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##             master    #5597    +/-   ##
==========================================
  Coverage     97.69%   97.70%            
- Complexity     7073     7124    +51     
==========================================
  Files           984      987     +3     
  Lines         20536    20662   +126     
  Branches       1344     1353     +9     
==========================================
+ Hits          20063    20188   +125     
- Misses          361      363     +2     
+ Partials        112      111     -1     

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