Fix a bunch of ResourceWarnings in iterator.test

src/ZODB/FileStorage/iterator.test

@@ -37,6 +37,8 @@ By default, we start at the beginning:
     >>> it.next().tid == tids[0]
     True
 
+    >>> it.close()
+
 The file iterator has an optimization to deal with large files.  It
 can serarch from either the front or the back of the file, depending
 on the starting transaction given.  To see this, we'll turn on debug
@@ -55,30 +57,42 @@ seems best and set the next record to that:
     >>> it.next().tid == tids[0]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[1])
     Scan forward data.fs:4 looking for '\x03z\xbd\xd8\xd06\x9c\xcc'
     >>> it.next().tid == tids[1]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[30])
     Scan forward data.fs:4 looking for '\x03z\xbd\xd8\xdc\x96.\xcc'
     >>> it.next().tid == tids[30]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[70])
     Scan backward data.fs:117080 looking for '\x03z\xbd\xd8\xed\xa7>\xcc'
     >>> it.next().tid == tids[70]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[-2])
     Scan backward data.fs:117080 looking for '\x03z\xbd\xd8\xfa\x06\xd0\xcc'
     >>> it.next().tid == tids[-2]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[-1])
     >>> it.next().tid == tids[-1]
     True
 
+    >>> it.close()
+
 We can also supply a file position.  This can speed up finding the
 starting point, or just pick up where another iterator left off:
 
@@ -86,28 +100,40 @@ starting point, or just pick up where another iterator left off:
     >>> it.next().tid == tids[51]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[0], pos=4)
     >>> it.next().tid == tids[0]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[-1], pos=poss[-2])
     >>> it.next().tid == tids[-1]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[50], pos=poss[50])
     Scan backward data.fs:35936 looking for '\x03z\xbd\xd8\xe5\x1e\xb6\xcc'
     >>> it.next().tid == tids[50]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[49], pos=poss[50])
     Scan backward data.fs:35936 looking for '\x03z\xbd\xd8\xe4\xb1|\xcc'
     >>> it.next().tid == tids[49]
     True
 
+    >>> it.close()
+
     >>> it = ZODB.FileStorage.FileIterator('data.fs', tids[51], pos=poss[50])
     >>> it.next().tid == tids[51]
     True
 
+    >>> it.close()
+
     >>> logging.getLogger().setLevel(old_log_level)
     >>> logging.getLogger().removeHandler(handler)
 
@@ -120,12 +146,16 @@ then the first transaction is returned.
     >>> it.next().tid == tids[0]
     True
 
+    >>> it.close()
+
 If it is after the last transaction, then iteration be empty:
 
     >>> it = ZODB.FileStorage.FileIterator('data.fs', p64(u64(tids[-1])+1))
     >>> list(it)
     []
 
+    >>> it.close()
+
 Even if we write more transactions:
 
     >>> it = ZODB.FileStorage.FileIterator('data.fs', p64(u64(tids[-1])+1))
@@ -135,8 +165,9 @@ Even if we write more transactions:
     >>> list(it)
     []
 
+    >>> it.close()
+
 .. Cleanup
 
     >>> time.time = time_time
-    >>> it.close()
     >>> db.close()