[WFCORE-6383] throwing boot errors if super.boot fails

[istudens]

Issue: https://issues.redhat.com/browse/WFCORE-6383

With this fix the ModelTestControllerService.boot() always throws new BootOperationFailedException if super.boot returns false.
Note that a few test-cases had to be changed according to it.
Regarding "BTW, I think the entire class can and should be package protected, but if there's some outside use I've missed, then never mind.", it is not possible as BootErrorCollector is also used outside the package.
Note 2: This will need a fix in WildFly code base in two PicketLink Subsystem tests. I will create a separate Jira for it.

[istudens]

@bstansberry can you review this please? thanks

[yersan]

Could you prepare a custom integration Job using your topic branches and link them to this PR?

WildFly requires this PR and the other way around, so an integration Job picking up your topic branches will allow us to test both PRs in conjunction before merging them.

Integration Jobs are available at https://ci.wildfly.org/buildConfiguration/WF_WildFlyCoreIntegrationExperiments

[istudens]

@yersan Ok, I gave it a try, it is job no 1192.

[istudens]

@yersan The integration job passed successfully, see https://ci.wildfly.org/buildConfiguration/WF_WildFlyCoreIntegrationExperiments/392051

[yersan]

Thanks @istudens , looks good to me, we will merge this one as the last PR for the final release.

Could you rebase and fix the conflicts?

[istudens]

Thanks @istudens , looks good to me, we will merge this one as the last PR for the final release.

Could you rebase and fix the conflicts?

done

[yersan]

Thanks @istudens