Add configurable DirectoryProvider so that alternate Directory implementations 
can be specified via solrconfig.xml
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                 Key: SOLR-465
                 URL: https://issues.apache.org/jira/browse/SOLR-465
             Project: Solr
          Issue Type: New Feature
    Affects Versions: 1.3
            Reporter: TJ Laurenzo


Solr is presently hard-coded to use the FSDirectory implementation in Lucene.  
Other Directory implementations are possible.  This patch creates a new 
DirectoryProvider interface and extends SolrCore to load an implementation of 
it from solrconfig.xml (if specified).  If not specified, then it will fallback 
to the FSDirectory.

A DirectoryProvider plugin can be configured in solrconfig.xml with the 
following XML:
   <directoryProvider class="class.name">
      <!-- Parameters as required by the implementation -->
   </directoryProvider>

This patch was created against solr trunk checked out on 11/20/2007.  Most of 
it is new code and should apply cleanly or with minor relocation.  If it does 
not, let me know and I will update.

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