Comment 6 for bug 1652748

I think this is a typical reliability issue. Operator may input some cmds by mistake sometimes.
So it's better to do a check in code.
I read the code, when a neutron *-agent started, it will send a report_status message to neutron-server as a register inform. All the agent will add a "start_flag" at the first message and remove the flag from the following report messages. Neutron server can check the DB and "start_flag" to judge if the new comming agent is a duplicated on a specific host.

So in my opinion ,it's a little effort big gain issue.
I just give out my advice.