The haproxy provider driver uses a dict for caching load balancer
resources (including children resources). That alone already increases
memory consumption. A neutron-server restart solves this.
But the real issue is that the driver leaves some data behind when a LB
is deleted without freeing it up (unless neutron-server is restart)
hence the memory leak.
Story: 2003802
Task: 26534
Change-Id: I7c79271998d839c6afbeb6d92f888f6acd67704e
111d0b2852