We can not assume that just because we could complete a TCP handshake

We can not assume that just because we could complete a TCP handshake
to the remote node  that
1, we are in fact talking to a CTDB daemon
2, that IF we are talking to a ctdb daemon, it is operational.

So, we can not blindly mark the node as CONNECTED just because
we can open a TCP connection.

Instead we rely on "If we did get a KEEPALIVE from the remote node,
is is connected"

(This used to be ctdb commit 60e2cb175c449ae65793a3e1ffb60cf030a3a0d5)