Refactor fabric8 discovery integration tests (2)

[wind57]

No description provided.

[wind57]

The idea of refactoring tests in this manner was talked with you here: #1755

This is a continuation of the same process, but I had to take a detour because other issues more important appeared. But now Im back to these... Logically the same exact same assertions are in place, nothing changed in that regard.

running time as-is, before this refactoring:

________________________________________________________
Executed in  260.82 secs    fish           external
   usr time   16.80 secs   94.00 micros   16.80 secs
   sys time    4.88 secs  673.00 micros    4.88 secs

after the refactoring:

________________________________________________________
Executed in  182.00 secs    fish           external
   usr time   27.18 secs   92.00 micros   27.18 secs
   sys time    5.55 secs  896.00 micros    5.55 secs

around 1.5 minutes saved.

[wind57]

@ryanjbaxter this one is ready too. thank you