Comment 7 for bug 1471022

To clarify, the reason I am not using wait-for-state (http://pastebin.ubuntu.com/11820672/) with WAIT_FOREVER=Y is primarily because it will attempt to start the WAIT_FOR service once only then go into an infinite wait loop which could be a problem in nova upgrade scenarios where we would be waiting for neutron-ovs-cleanup to start when it may not, itself, be waiting to start perhaps because it (or it's dependencies) might never start resulting in nova-compute never starting. So what I am implementing here is a repeated retry with increasing interval but with a finite number of attempts so that nova-compute will always eventually start but not after giving neutron-ovs-cleanup (if installed) plenty of time to start.