Move cron loading below provider loading.
Move cron loading below provider loading.

This is preparation for making the cleanup cron job run per-provider
rather than globally.

Change-Id: I2cc0ec62b9779fa2500c6c67f014739dfec9205c

seandst/nodepool,Tesora/tesora-nodepool,Tesora/tesora-nodepool,citrix-openstack/nodepool,citrix-openstack/nodepool,seandst/nodepool