flaky reconnect

[mafintosh]

sometimes reconnect doesn't work if a peer is offline for more than the RETRIES array allow.

[fnaranjo-vmw]

I think this may be related to a problem I have identified.

(While in sync mode): When a peer gets dropped for some reason it is not possible to reconnect because it gets caught as "duplicated". Unless we stop the process and start a new one or the peer changes its id (uses a different port, for example).

I think I have found the cause of this issue. I will submit a pull request.