Add GetOOMScore function

[crosbymichael]

Signed-off-by: Michael Crosby crosbymichael@gmail.com

[codecov-io]

Codecov Report

Merging #3194 into master will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #3194      +/-   ##
==========================================
+ Coverage   45.23%   45.24%   +0.01%     
==========================================
  Files         111      111              
  Lines       11990    11996       +6     
==========================================
+ Hits         5424     5428       +4     
- Misses       5732     5733       +1     
- Partials      834      835       +1

Flag	Coverage Δ
#linux	49.28% <66.66%> (+0.01%)	⬆️
#windows	40.62% <ø> (ø)	⬆️

Impacted Files	Coverage Δ
sys/oom_unix.go	70.58% <66.66%> (-2.14%)	⬇️

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[Random-Liu]

LGTM

[estesp]

LGTM