LIBHYDRA-577: Updating about controller to ping Solr #398
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When visiting the about page, pinging solr so that when refreshing the user can be sure that Solr is back up again. Previously refreshing the page would have user's think the service was back up. Now a flash screen will appear on refresh's of the page.
https://umd-dit.atlassian.net/browse/LIBHYDRA-577