[ZEPPELIN-2467] Restoring second travis job functionality#2300

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AlexanderShoshin wants to merge 3 commits intoapache:masterfrom

AlexanderShoshin:ZEPPELIN-2467

Commits on Apr 28, 2017

added ability to exclude some unit tests using command line
AlexanderShoshin
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changed -Dtest flag to -Dtests.to.exclude and excluded unstable tests
AlexanderShoshin
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Commits on May 3, 2017

made a comment about excluded tests
AlexanderShoshin
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