WorkflowPersistenceManagerImpl createMissingFolders is slow

The createMissingFolders method should check top-down instead of bottom-up.

For example if the path /a/b/c/d exists en the path /a/b/c/d/e/f must be created to which 10 docs must be added, it now check a, b, c and d for the first document and a,b,c,d, e and f every time for the other documents.

It should check: f, e, d for the first document and create the missing folders and then for the other document it just has to check f.