Added Unit Tests For User Service

[code-incubus]

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

Added several unit test scenarios for User Service.

Related Issue
None

Description of the solution adopted
Test scenarios that are added in this PR are checking functionalities regarding Users. All scenarios are added to UserService.feature. Scenarios are testing if Users are correctly filtered or not.

Screenshots
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Any side note on the changes made
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[LeoNerdoG]

Hi @Coduz,
I have checked this PR and it looks good. You can merge it when the tests complete.

[codecov]

Codecov Report

Merging #2863 into develop will increase coverage by 0.53%.
The diff coverage is n/a.

@@              Coverage Diff              @@
##             develop    #2863      +/-   ##
=============================================
+ Coverage      54.65%   55.18%   +0.53%     
- Complexity      2299     2358      +59     
=============================================
  Files           1009     1009              
  Lines          21798    21798              
  Branches        1976     1976              
=============================================
+ Hits           11913    12029     +116     
+ Misses          8976     8861     -115     
+ Partials         909      908       -1

Impacted Files	Coverage Δ	Complexity Δ
...pse/kapua/transport/mqtt/MqttClientErrorCodes.java	0% <0%> (-100%)	0% <0%> (-1%)
...ipse/kapua/transport/mqtt/MqttClientException.java	0% <0%> (-28.58%)	0% <0%> (-1%)
...pse/kapua/broker/core/pool/JmsConsumerWrapper.java	60% <0%> (-15%)	0% <0%> (ø)
...ransport/mqtt/pooling/PooledMqttClientFactory.java	76.66% <0%> (-10%)	6% <0%> (ø)
...a/org/eclipse/kapua/transport/mqtt/MqttClient.java	56.41% <0%> (-6.42%)	13% <0%> (ø)
.../broker/core/plugin/KapuaSecurityBrokerFilter.java	75.23% <0%> (-0.93%)	0% <0%> (ø)
...pse/kapua/commons/service/internal/ServiceDAO.java	77.16% <0%> (+1.73%)	0% <0%> (ø)	⬇️
...apua/job/engine/jbatch/JobEngineServiceJbatch.java	51.85% <0%> (+1.85%)	8% <0%> (ø)	⬇️
...onfiguration/AbstractKapuaConfigurableService.java	80% <0%> (+3.63%)	0% <0%> (ø)	⬇️
...e/kapua/service/job/step/internal/JobStepImpl.java	70.37% <0%> (+3.7%)	11% <0%> (+1%)	⬆️
... and 18 more

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