ctdb-tcp: Do not stop outbound connection in ctdb_tcp_node_connect()

ctdb-tcp: Do not stop outbound connection in ctdb_tcp_node_connect()

The only place the outgoing connection needs to be stopped is when
there is a timeout when waiting for the connection to become writable.
Add a new function ctdb_tcp_node_connect_timeout() to handle this
case.

All of the other cases are attempts to establish a new outgoing
connection (initial attempt, retry after an error or disconnect, ...)
so drop stopping the connection in those cases.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=14295

Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Signed-off-by: Martin Schwenke <martin@meltin.net>
Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Thu Mar 12 05:29:20 UTC 2020 on sn-devel-184

(cherry picked from commit 319c93f0c6a949545229b616dfbd4f51baf11171)

Autobuild-User(v4-12-test): Karolin Seeger <kseeger@samba.org>
Autobuild-Date(v4-12-test): Thu Mar 19 12:19:52 UTC 2020 on sn-devel-184