*add solr upgrade test which tests upgrade to 4.10.4 from 4.7.0 and a…#799

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add-tests/zl/upgrade-solr

Commits on Jun 2, 2015

*add solr upgrade test which tests upgrade to 4.10.4 from 4.7.0 and also tests a downgrade when previous was riak-2.1.1 *clean-up yokozuna_rt for reusability
zeeshanlakhani
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