ZEPPELIN-928: fix flaky ZeppelinIT test for Spark interpreter#939

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bzz wants to merge 2 commits intoapache:masterfrom

bzz:fix/ZEPPELIN-928

Commits on May 31, 2016

New Interpreter validation: prohibit whitespace names and correct error msg
bzz
committed
Interpreter creation: add ID to the HTML and update Integration tests to use simple xpath
bzz
committed