Ticket 48158 - Remove cleanAllRUV task limit of 4
Bug Description: There is a limit of 4 concurrent tasks, and this is too
low of a limit.
Fix Description: There still needs to be a limit because each task creates
a new thread. Setting limit to 64.
https://fedorahosted.org/389/ticket/48158
Reviewed by: rmeggins(Thanks!)
(cherry picked from commit cd8614a75852f4d05dc76d104867542f18384416)