Increase test coverage and add integration tests against mount point not supporting quotas

[speijnik]

Signed-off-by: Stephan Peijnik speijnik@anexia-it.com

[codecov-io]

Codecov Report

Merging #4 into master will increase coverage by 25.46%.
The diff coverage is 20%.

@@             Coverage Diff             @@
##           master       #4       +/-   ##
===========================================
+ Coverage   49.81%   75.28%   +25.46%     
===========================================
  Files           7        7               
  Lines         265      267        +2     
===========================================
+ Hits          132      201       +69     
+ Misses        119       47       -72     
- Partials       14       19        +5

Impacted Files	Coverage Δ
fsquota_linux.go	57.44% <20%> (+20.03%)	⬆️
fsquota.go	100% <0%> (+25%)	⬆️
util_linux.go	88.57% <0%> (+88.57%)	⬆️
info.go	100% <0%> (+100%)	⬆️

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