Added ability to override environment variables in capability (fixes …

[vania-pooh]

…#405)

[codecov-io]

Codecov Report

Merging #407 into master will decrease coverage by 0.06%.
The diff coverage is 91.66%.

@@            Coverage Diff             @@
##           master     #407      +/-   ##
==========================================
- Coverage   74.81%   74.75%   -0.07%     
==========================================
  Files           9        9              
  Lines        1100     1101       +1     
==========================================
  Hits          823      823              
- Misses        226      227       +1     
  Partials       51       51

Flag	Coverage Δ
#unittests	74.75% <91.66%> (-0.07%)	⬇️

Impacted Files	Coverage Δ
session/session.go	94.44% <ø> (ø)	⬆️
service/driver.go	0% <0%> (ø)	⬆️
service/docker.go	81.99% <100%> (ø)	⬆️
service/service.go	72.91% <100%> (ø)	⬆️

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