SOLR-3702: A 'concat' function query to support concatenation of Strings

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SOLR-3702: Reverting commit because it breaks QueryEqualityTest

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SOLR-5555: CloudSolrServer and LBHttpSolrServer shouldn't throw MUE from constructors

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SOLR-5543: Core Swaps result in duplicate entries in solr.xml

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Fix test bug

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package summary fix

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