Not all Neutron agents are shown in horizon

[AJNOURI]

From the network node, all needed agents are running:

root@network:/# for agent in neutron-plugin-openvswitch-agent neutron-l3-agent neutron-dhcp-agent neutron-metadata-agent; do \
> service $agent status; done;
neutron-plugin-openvswitch-agent start/running, process 2101
neutron-l3-agent start/running, process 2145
neutron-dhcp-agent start/running, process 2170
neutron-metadata-agent start/running, process 2189

But Horizon doesn't show all agents as expected (from tutorial):

[AJNOURI]

Could be related to #2