Need add "ipset" into requirements.txt because it's enabled default

[Wang Bo]

Since this patch https://review.openstack.org/#/c/111877 has been merged. Neutron ovs-agent used ipset to apply securitygroup rules on compute node now. If ipset was not installed on compute node, it will report this error:

File "/usr/lib/python2.6/site-packages/neutron/agent/linux/iptables_manager.py", line 424, in _apply_synchronized
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent root_helper=self.root_helper)
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent File "/usr/lib/python2.6/site-packages/neutron/agent/linux/utils.py", line 81, in execute
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent raise RuntimeError(m)
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent RuntimeError:
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent Command: ['sudo', 'neutron-rootwrap', '/etc/neutron/rootwrap.conf', 'iptables-restore', '-c']
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent Exit code: 1
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent Stdout: ''
2014-09-25 02:15:20.668 18151 TRACE neutron.plugins.openvswitch.agent.ovs_neutron_agent Stderr: 'iptables-restore v1.4.7: Kernel module ip_set is not loaded in.\n\n'

I think it need to add ipset into requirements.txt to ensure it could be installed when neutron ovs-agent installed.

[Armando Migliaccio (armando-migliaccio)]

requirements.txt is for python dependencies; ipset is not a python package and need to be distributed via the distro's package manager of your choice. This bug is invalid.