Broker Security Plugin enhancements

[riccardomodanese]

Broker security plugin/context cleanup.
Reorganize the security context related objects and make the authorization code pluggable to allow extension.

Related Issue
none

Description of the solution adopted
none

Screenshots
none

Any side note on the changes made
none

[codecov]

Codecov Report

Merging #3066 into develop will increase coverage by 1.27%.
The diff coverage is 75.75%.

@@              Coverage Diff              @@
##             develop    #3066      +/-   ##
=============================================
+ Coverage      59.61%   60.88%   +1.27%     
- Complexity      2489     2588      +99     
=============================================
  Files           1071     1073       +2     
  Lines          22870    22922      +52     
  Branches        2023     2033      +10     
=============================================
+ Hits           13633    13956     +323     
+ Misses          8307     8017     -290     
- Partials         930      949      +19     

Impacted Files	Coverage Δ	Complexity Δ
...oker/core/message/system/SystemMessageCreator.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...ua/broker/core/plugin/KapuaSecurityAclChecker.java	0.00% <0.00%> (ø)	0.00 <0.00> (?)
.../kapua/broker/core/plugin/metric/ClientMetric.java	100.00% <ø> (ø)	0.00 <0.00> (ø)
...pua/broker/core/plugin/metric/SecurityMetrics.java	0.00% <ø> (ø)	0.00 <0.00> (ø)
...r/core/plugin/authorization/DefaultAuthorizer.java	50.00% <50.00%> (ø)	0.00 <0.00> (?)
...kapua/broker/core/plugin/KapuaSecurityContext.java	69.31% <67.08%> (-1.52%)	0.00 <0.00> (ø)
...ore/plugin/authentication/AuthenticationLogic.java	85.00% <69.23%> (ø)	0.00 <0.00> (ø)
...lugin/authentication/AdminAuthenticationLogic.java	71.42% <75.00%> (+2.19%)	0.00 <0.00> (ø)
.../broker/core/plugin/KapuaSecurityBrokerFilter.java	74.85% <76.51%> (-1.01%)	0.00 <0.00> (ø)
...plugin/authentication/UserAuthenticationLogic.java	83.03% <80.35%> (+8.03%)	0.00 <0.00> (ø)
... and 56 more