Eliminate double-database close log messages

* BdbModule.java
   split openDatabase() to openManagedDatabase() (auto-closed) and plain openDatabase() (caller-closes)
   set TempStoredSortedMap to use unmanaged openDatabase
* (others)
   use openManagedDatabase()

engine/src/main/java/org/archive/crawler/frontier/BdbFrontier.java

@@ -123,7 +123,7 @@ implements Serializable, Checkpointable {
             dbConfig.setAllowCreate(!recycle);
             // Make database deferred write: URLs that are added then removed 
             // before a page-out is required need never cause disk IO.
-            db = bdb.openDatabase("pending", dbConfig, recycle);
+            db = bdb.openManagedDatabase("pending", dbConfig, recycle);
         }
         
         return new BdbMultipleWorkQueues(db, bdb.getClassCatalog());
@@ -248,7 +248,7 @@ implements Serializable, Checkpointable {
         inactiveQueuesByPrecedence = new TreeMap<Integer,Queue<String>>();
         
         Database retiredQueuesDb;
-        retiredQueuesDb = bdb.openDatabase("retiredQueues", 
+        retiredQueuesDb = bdb.openManagedDatabase("retiredQueues", 
                 StoredQueue.databaseConfig(), false);
         retiredQueues = new StoredQueue<String>(retiredQueuesDb,
                 String.class, null);
@@ -270,7 +270,7 @@ implements Serializable, Checkpointable {
     Queue<String> createInactiveQueueForPrecedence(int precedence) {
         Database inactiveQueuesDb;
         try {
-            inactiveQueuesDb = bdb.openDatabase("inactiveQueues-"+precedence,
+            inactiveQueuesDb = bdb.openManagedDatabase("inactiveQueues-"+precedence,
                     StoredQueue.databaseConfig(), false);
         } catch (DatabaseException e) {
             throw new RuntimeException(e);

engine/src/main/java/org/archive/crawler/frontier/precedence/PreloadedUriPrecedencePolicy.java

@@ -87,7 +87,7 @@ implements Lifecycle {
             StoredClassCatalog classCatalog = bdb.getClassCatalog();
             BdbModule.BdbConfig dbConfig = PersistProcessor.historyDatabaseConfig();
 
-            historyDb = bdb.openDatabase(dbName, dbConfig, true);
+            historyDb = bdb.openManagedDatabase(dbName, dbConfig, true);
             historyMap = new StoredSortedMap(historyDb,
                     new StringBinding(), new SerialBinding(classCatalog,
                             Map.class), true);

engine/src/main/java/org/archive/crawler/util/BdbUriUniqFilter.java

@@ -103,7 +103,7 @@ implements Lifecycle, Serializable {
         try {
             BdbModule.BdbConfig config = getDatabaseConfig();
             config.setAllowCreate(true);
-            initialize(bdb.openDatabase(DB_NAME, config, false));
+            initialize(bdb.openManagedDatabase(DB_NAME, config, false));
         } catch (DatabaseException e) {
             throw new IllegalStateException(e);
         }