ctdb-protocol: Add generalised socket address comparison
Add new function ctdb_sock_addr_cmp(), which returns a 3-way result
useful for qsort(3). Reimplent ctdb_sock_addr_same() using this.
In the process, make arguments const so that ctdb_sock_addr_cmp() can
be used with qsort().
BUG: https://bugzilla.samba.org/show_bug.cgi?id=12470
Signed-off-by: Martin Schwenke <martin@meltin.net>
Reviewed-by: Amitay Isaacs <amitay@gmail.com>
(cherry picked from commit
362f066d617c8a186164db613537867329702ab7)