lnd_test: give peers more time to successfully attempt connection
lnd_test: give peers more time to successfully attempt connection

We might hit a connection refused error in cases where the peer connects
to us exactly as we try to connect to it. We retry the connection within
a wait predicat, as it should be the case that the other peer
establishes the connection, and the two peers actually connects.

LightningNetwork/lnd,aakselrod/lnd,aakselrod/lnd,LightningNetwork/lnd