ctdb-server: Clean up connection tracking functions

ctdb-server: Clean up connection tracking functions

Apply README.Coding, modernise logging, pre-render connection as a
string for logging, switch terminology from "tickle" to "connection",
tidy up comments.

No changes in functionality.

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15320
RN: Update CTDB to track all TCP connections to public IP addresses

Signed-off-by: Martin Schwenke <mschwenke@ddn.com>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jerry Heyman <jheyman@ddn.com>
(cherry picked from commit 3c19c8df778070705485b3c993e695ca1636bfa7)