Remove deprecated LOADBALANCERS.DEVICE column

Change-Id: I418bbd56ad055fa32f17db66eb314e65eb8ac703
[ADMIN_API]: Remove eventlet monkey_patch

The eventlet monkey_patch is causing the threading timers to execute
sequentially, locking each other out rather than in-(psuedo)parallel.
We don't actually need it at the moment.

Change-Id: I97aef29976f21c5c32ef2a299d799987aa024745