Comment 38 for bug 1432242

Verified on fuel-6.1-445-2015-05-20_22-10-04.iso.

Steps to verify:
    1. Deploy Ubuntu HA with 3 controllers
    2. Restart memcached services at controllers one by one, but do not restart keystone services
    3. At some controller, run ". openrc; while true; do date; neutron subnet-list | awk '$4 == "net04__subnet" {print}'; sleep 2; done"