Comment 53 for bug 1752838

Confirmed that removing Require-openvswitch-switch.server line in neutron-ovs-cleanup.service file solve regression and this order issue.

but as I mentioned just before, if there are a lot of (1000) ports there, 14 alarm clock error when running neutron-ovs-cleanup

and this[1] is pop up (this one I could see in the beginning sometimes)
also adding ExecPre= line solve it as well. ( in xenial )

[1] https://bugs.launchpad.net/cloud-archive/+bug/1630968