Fix unit test failure.

[wddgit]

In test diff ignore text some class is printing to std::out in its constructor.

[cmsbuild]

A new Pull Request was created by @wddgit (W. David Dagenhart) for CMSSW_7_1_THREADED_X.

Fix unit test failure.

It involves the following packages:

IOMC/RandomEngine

@cmsbuild, @Degano, @Dr15Jones, @ktf, @nclopezo can you please review it and eventually sign? Thanks.
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[ktf]

Why threaded only?

[wddgit]

The fix is only on the threaded branch, because the failing test does not exist on the 7_1_X branch. It is an explicit test of multiple streams. It was created with the multithreaded random number service which was only merged into the threaded branch so far. We did not merge it into the 7_1_X branch because it breaks some RelVals because there is still code that uses the old interface. When the old interface is used with the new multithreaded service, replay is broken and that is what is causing RelVals to fail.

A separate issue. I do not understand why the class causing the error is ever constructed because nothing in the test uses it or references it as far as I know. Maybe something in the dictionary loading? I don't know.

[ktf]

Ok, thanks for the explanation. I'll merge your stuff. We should probably have a campaign to clean up std::cout as well... :-/

[Dr15Jones]

The threaded build has to load all known dictionaries into the job to avoid problems with ROOT.