(maint) Log a warning when the db-up? query fails

This is intended to log an error in PE tests without having to configure
logback.xml. Before releasing, this should be removed or changed to log
at the debug level

Author: austb

src/puppetlabs/puppetdb/scf/storage_utils.clj

@@ -372,7 +372,8 @@
         (let [select-42 "SELECT (a - b) AS answer FROM (VALUES ((7 * 7), 7)) AS x(a, b)"
               [{:keys [answer]}] (jdbc/query [select-42])]
           (= answer 42)))
-      (catch Exception _
+      (catch Exception e
+        (log/warn e "Query to check if the database is up failed")
         false))))
 
 (defn analyze-small-tables