[ACS44] cherry pick

[Kelven Yang]

Hi Daan,
Could you cherry-pick following fix in 4.4-forward to 4.4 branch.

commit be2b5918e6b09a488d75966c49d34bdeb803fdd8
Author: Kelven Yang <kelv...@gmail.com>
Date:   Mon May 5 15:21:59 2014 -0700

    CLOUDSTACK-6586: Move EventBus hookup on job framework to ApiServer to
decouple job framework away from business logic related hookups.

Thanks

Kelven