Commits on May 22, 2018

1. QA: Add xpack tests to rolling upgrade …

   A rolling upgrade from oss Elasticsearch to the default distribution of
   Elasticsearch is significantly different than a full cluster restart to
   install a plugin and is again different from starting a new cluster with
   xpack installed. So this adds some basic tests to make sure that the
   rolling upgrade that enables xpack works at all.
   
   This also removes some unused imports from the tests that I modified in
   PR elastic#30728. I didn't mean to leave them.

   

   nik9000 committed May 22, 2018
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