Comment 2 for bug 1494281

When I created devstack environment to test Ironic, I got exactly same error.

2015-09-14 14:58:59.044 DEBUG neutron.agent.linux.utils [req-59679578-c564-488f-8331-c8f61e2e5c0b None None] Running command (rootwrap daemon): ['ovs-vsctl', '--timeout=10', '--oneline', '--format=json', '--', '--columns=name,other_config,tag', 'list', 'Port', 'tapea890f2b-7c'] from (pid=29175) execute_rootwrap_daemon /opt/stack/neutron/neutron/agent/linux/utils.py:102
2015-09-14 14:58:59.091 DEBUG neutron.agent.linux.utils [req-59679578-c564-488f-8331-c8f61e2e5c0b None None]
Command: ['ovs-vsctl', '--timeout=10', '--oneline', '--format=json', '--', '--columns=name,other_config,tag', 'list', 'Port', u'tapea890f2b-7c']
Exit code: 0
 from (pid=29175) execute /opt/stack/neutron/neutron/agent/linux/utils.py:157
2015-09-14 14:58:59.092 ERROR neutron.plugins.ml2.drivers.openvswitch.agent.ovs_neutron_agent [req-59679578-c564-488f-8331-c8f61e2e5c0b None None] invalid literal for int() with base 10: 'None' Agent terminated!
2015-09-14 14:58:59.109 INFO oslo_rootwrap.client [req-59679578-c564-488f-8331-c8f61e2e5c0b None None] Stopping rootwrap daemon process with pid=29343