Added JUnit tests for SystemUtils class

[code-incubus]

Signed-off-by: code-incubus nemanja.milutinovic@comtrade.com

Added JUnit tests for the SystemUtils class.

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Any side note on the changes made
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[LeoNerdoG]

@code-incubus, I have checked this PR and there are some changes to be made.
Please address the changes and then push branch once again.

Thanks!

[LeoNerdoG]

@Coduz,
I have checekd this PR and it looks OK. Can you please merge it when CI and tests pass? Thanks!

[codecov]

Codecov Report

Merging #2943 into develop will increase coverage by 0.49%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2943      +/-   ##
=============================================
+ Coverage      55.23%   55.73%   +0.49%     
- Complexity      2554     2558       +4     
=============================================
  Files           1048     1048              
  Lines          22810    22810              
  Branches        2051     2051              
=============================================
+ Hits           12599    12713     +114     
+ Misses          9253     9147     -106     
+ Partials         958      950       -8     

Impacted Files	Coverage Δ	Complexity Δ
...e/kapua/service/user/internal/UserFactoryImpl.java	54.54% <0.00%> (-9.10%)	4.00% <0.00%> (-1.00%)
.../DeviceManagementNotificationMessageProcessor.java	64.28% <0.00%> (-7.15%)	0.00% <0.00%> (ø%)
...a/org/eclipse/kapua/commons/model/id/KapuaEid.java	75.00% <0.00%> (-6.25%)	0.00% <0.00%> (ø%)
.../eclipse/kapua/service/user/internal/UserImpl.java	70.27% <0.00%> (-5.41%)	16.00% <0.00%> (-1.00%)
...rvice/device/registry/common/DeviceValidation.java	71.25% <0.00%> (-2.50%)	14.00% <0.00%> (-1.00%)
...apua/job/engine/jbatch/JobEngineServiceJbatch.java	51.85% <0.00%> (-1.86%)	8.00% <0.00%> (-1.00%)
...pse/kapua/commons/service/internal/ServiceDAO.java	74.67% <0.00%> (-0.33%)	0.00% <0.00%> (ø%)
...onfiguration/AbstractKapuaConfigurableService.java	80.90% <0.00%> (+0.90%)	0.00% <0.00%> (ø%)
...e/kapua/job/engine/jbatch/driver/JbatchDriver.java	70.07% <0.00%> (+2.36%)	21.00% <0.00%> (ø%)
...se/kapua/commons/configuration/ValueTokenizer.java	43.20% <0.00%> (+2.40%)	0.00% <0.00%> (ø%)
... and 19 more

[LeoNerdoG]

Hi @Coduz,
this PR is no longer work in progress, it is done.
All the checks have passed successfully, so can you please merge it?