Attempt to connect to disconnected peers from time to time

[vitorenesduarte]

[cmeiklejohn]

Should this be done for all backends?

[vitorenesduarte]

I noticed this was only being done when new connections occur in static, client_server and default.
Not sure about hyparview.
I'm inducing partitions using iptables, and when I remove the rules, the connections don't restore.