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Sorry for a long reply, wasn't subscribed for the notifications and
missed you comments :(

So I've double-checked I'm running the neutron master. This doesn't seem
to be an L3-agent issue. I'm running Neutron master as of commit
24718e6f1764e95f0c393ba042546e3584981b31 (Ubuntu 14.04,
3.13.0-29-generic, OVS 2.0.1+git20140120-0ubuntu2).


Steps to reproduce:

1. Run tripleo devtest story. This will give you a 3 node cluster - 1 controller node + 2 compute nodes. Neutron ML2 plugin is used, OVS agents are run on each node.
2. SSH to a controller node.
3. Start pinging the VM using its private IP address from a DHCP agent namespace.
4. SSH to a compute node running the VM.
5. Restart the OVS.
6. The ping stops working until neutron-openvswitch-agent is restarted on the compute node.

Right after OVS restart I see this in neutron-openvswitch-agent log: http://paste.openstack.org/show/84472/
The complete log is here http://paste.openstack.org/show/84473/ (there are some errors, but I'm not sure they are related to this problem, 'WAS HERE' is a string I log to ensure the code of your fix is executed)

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https://bugs.launchpad.net/bugs/1290486

Title:
  neutron-openvswitch-agent does not recreate flows after ovsdb-server
  restarts

Status in OpenStack Neutron (virtual network service):
  Fix Released
Status in neutron icehouse series:
  Fix Released
Status in tripleo - openstack on openstack:
  Triaged

Bug description:
  The DHCP requests were not being responded to after they were seen on
  the undercloud network interface.  The neutron services were restarted
  in an attempt to ensure they had the newest configuration and knew
  they were supposed to respond to the requests.

  Rather than using the heat stack create (called in
  devtest_overcloud.sh) to test, it was simple to use the following to
  directly boot a baremetal node.

      nova boot --flavor $(nova flavor-list | grep "|[[:space:]]*baremetal[[:space:]]*|" | awk '{print $2}) \
            --image $(nova image-list | grep "|[[:space:]]*overcloud-control[[:space:]]*|" | awk '{print $2}') \
            bm-test1

  Whilst the baremetal node was attempting to pxe boot a restart of the
  neutron services was performed.  This allowed the baremetal node to
  boot.

  It has been observed that a neutron restart was needed for each
  subsequent reboot of the baremetal nodes to succeed.

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