Have panopoly_search SOLR intergration configured for node access by default

This would be quite helpful. I tried to do this originally and there was some features/search api integration. Worth a look to get it rolling.

The solr configuration does seem to have node access on by default:

Ah yes, of course. Blah.

Here is a patch that will do what we want. Needs testing on a Solr setup.

This issue still makes sense! I think changes are necessary to the server export too, though. At least they are necessary in the database server export, which current has:

          "search_api_access_node" : {
            "table" : "search_api_db_database_node_index_search_api_access_node",
            "column" : "value",
            "type" : "list\\u003Cstring\\u003E",
            "boost" : "1.0"
          },

But I haven't actually tested it.

Adding to the sprint board.

I re-rolled the Feature update from #5, and added an update hook to ensure the Feature would not be overridden.

Re #7: Only the database server export contains info about its fields in panopoly_search_default_search_api_server(); the Solr configuration does not.

Thanks! Worked in my testing, so committed.