Build time improvement

[bartoszmajsak]

As we are adding more and more functional tests our build is taking quite a bit of time which will make it harder to have fast feedback loops (either locally or on the CI server). It bumped from ~4:30min to above 7 on my local machine:

[INFO] Reactor Summary:                                                                                                                       
[INFO]                                                                                                                                        
[INFO] Smart testing ...................................... SUCCESS [  0.727 s]                                                               
[INFO] smart-testing-core ................................. SUCCESS [ 13.491 s]                                                               
[INFO] junit-test-result-parser ........................... SUCCESS [  1.728 s]                                                               
[INFO] smart-testing-surefire-provider .................... SUCCESS [  7.337 s]                                                               
[INFO] smart-testing-strategy-changed ..................... SUCCESS [  4.464 s]                                                               
[INFO] smart-testing-strategy-affected .................... SUCCESS [  9.435 s]                                                               
[INFO] smart-testing-strategy-failed ...................... SUCCESS [  2.511 s]                                                               
[INFO] smart-testing-maven-lifecycle-extension ............ SUCCESS [  4.022 s]                                                               
[INFO] smart-testing-test-bed ............................. SUCCESS [07:17 min]                                                               
[INFO] ------------------------------------------------------------------------                                                               
[INFO] BUILD SUCCESS               
[INFO] ------------------------------------------------------------------------                                                               
[INFO] Total time: 07:49 min (Wall Clock)                              
[INFO] Finished at: 2017-09-05T22:17:52+02:00                          
[INFO] Final Memory: 40M/1385M     
[INFO] ------------------------------------------------------------------------ 

We should review our Test Bed tests in order to:

• minimize redundant/overlapping tests
• identify those which we could test in isolation (unit tests)
• narrow the builds for only relevant modules, e.g. .build("config/impl-base") where necessary

[lordofthejars]

I think .build("config/impl-base") could be applied in several tests.

[MatousJobanek]

I'm reopening as there is another (not merged) PR related to this issue: #204