missing client connect url after re connect of restarted server is processed before disconnect.

[matthiashanel]

Defect

added a unit test #1516 to illustrate the issue.

Basically we use a map of url, when that kind or re-ordering happens we forget about a url.

This can also be re-produced whit the following setup.
Server_A)
Client_advertise URLA

Server_B and Server_C have the same value in client_advertise
client_advertise URLBC

When starting all 3 server and connecting via telnet to server_A,
connect_urls will contain URLA and URLBC

if Server_B OR Server_C is shut down, server_A will only return URLA.

This can be solved by ref counting the url entires in the map or using a list instead.

Another oddity is that if all server provide the same value for client_advertise, the list will contain two identical entries.
One for the current server, one for the other server.

The unit test and the example here are a bit contrived.
However, I only looked at this because a user reported that connect_urls was off.