[SAFS][adv-comp-19]: only allow user compute to generate reqs once.
[SAFS][adv-comp-19]: only allow user compute to generate reqs once.

This is a temporary solution.

icoming/FlashGraph,silky/FlashGraph,icoming/FlashX,silky/FlashGraph,flashxio/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashX,silky/FlashGraph,silky/FlashGraph,zheng-da/FlashX,icoming/FlashX,zheng-da/FlashX,flashxio/FlashX,flashxio/FlashX,zheng-da/FlashX,silky/FlashGraph,flashxio/FlashX,flashxio/FlashX,icoming/FlashX,flashxio/FlashX,icoming/FlashGraph,icoming/FlashX,zheng-da/FlashX,icoming/FlashGraph,icoming/FlashGraph