Fix: GoTestFunc dont respect go_test_timeout

[wmatusiak]

Fixes #1619

Adds go_test_timeout support to GoTestFunc

[codecov-io]

Codecov Report

Merging #1631 into master will decrease coverage by 0.01%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master    #1631      +/-   ##
==========================================
- Coverage   19.19%   19.17%   -0.02%     
==========================================
  Files          53       53              
  Lines        4153     4156       +3     
==========================================
  Hits          797      797              
- Misses       3356     3359       +3

Flag	Coverage Δ
#nvim	14.53% <0%> (-0.02%)	⬇️
#vim74	17.56% <0%> (-0.02%)	⬇️
#vim80	18.33% <0%> (-0.02%)	⬇️

Impacted Files	Coverage Δ
autoload/go/test.vim	68.71% <0%> (-1.29%)	⬇️

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[bhcleek]

Thank you @wmatusiak.