[keycloak-dev] Arquillian testsuite: realm import per class now

[Marek Posolda]

So testsuite-arquillian is now using the realm import per class 
similarly like the old testsuite. Also there is just one adminClient and 
one testingClient per class now.

This was identified as one of the two major bottlenecks (The second was 
the phantomjs, which was changed to htmlUnit earlier). With both 
changes, running the arquillian testsuite takes 10 minutes instead of 36 
on my laptop.

There was quite a lot of changes needed to achieve this as many test 
methods relied on the fact that realm is imported and didn't clean stuff 
after itself.

I may not fix all the tests, especially not those, which are not 
executed during default build (eg. cluster tests). In case that you 
found your test is broken you can do either:
- Fix the tests to clean after itself without realm reimport needed 
after every test. This is preferred way :)
- Add this to your test class:

     @Override
     protected boolean isImportAfterEachMethod() {
         return true;
     }

This is fallback to previous behaviour and will cause the import after 
each test method like was before. Hopefully this option can be removed 
after some time once all tests are fixed :)

For now, I needed to use it for all adapter tests (added into 
AbstractAdapterTest) as some adapter tests were still failing and I 
don't have much time to investigate further.. Created 
https://issues.jboss.org/browse/KEYCLOAK-4517 .

Marek