If test fails, return a non-zero exit code

[wmtan]

This pull request affects unit tests only.
Many unit tests in CondCore/* packages return a zero return value even if the test fails. This causes failures to not be reported as failures in the IB.
In the ROOT 6 IB, there were approximately 15 test failures that were not noticed until now because of this.
NOTE: Since these code changes are not ROOT 6 specific, they are also being pull requested in the main 7_3_X branch for code commonality.
Please merge this request in the ROOT6 branch as soon as convenient.

[cmsbuild]

A new Pull Request was created by @wmtan for CMSSW_7_3_ROOT6_X.

If test fails, return a non-zero exit code

It involves the following packages:

CondCore/DBCommon
CondCore/IOVService
CondCore/ORA

@apfeiffer1, @nclopezo, @cerminar, @cmsbuild, @diguida, @rcastello, @ggovi, @mmusich can you please review it and eventually sign? Thanks.
@ghellwig this is something you requested to watch as well.
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