Fiddle one more get_pickle_metadata import.

This one doesn't exist on the 3.3 branch.

src/ZODB/FileStorage/fsoids.py

@@ -13,7 +13,7 @@
 ##############################################################################
 
 import ZODB.FileStorage
-from ZODB.FileStorage.fsdump import get_pickle_metadata
+from ZODB.utils import get_pickle_metadata
 from ZODB.utils import U64, p64, oid_repr, tid_repr, get_refs
 from ZODB.TimeStamp import TimeStamp