swrap: fix copy on write leak of ~38M for every fork.

swrap: fix copy on write leak of ~38M for every fork.

commit 0f8e90dd7e59c473be615dee08d445dca98fdab9
(src/socket_wrapper.c: fix mutex fork handling)
let us touch the whole sockets array on every fork,
because each element in the array has it's own mutex.

max_sockets=65535 * sizeof(struct socket_info_container)=592 = 38796720

This was designed for the use of robust shared mutexes
when moving the sockets array into a shared memory file.

Until we really move to shared memory, we can use a single
global mutex in order to avoid the copy on write leaking.

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Andreas Schneider <asn@samba.org>