LU-18137 ksocklnd: Fix TCP socket cleanup

LU-18137 ksocklnd: Fix TCP socket cleanup

Linux upstream commit v6.11-rc3-g151c9c724d05d5b0d changed the
handling of orphaned TCP connections. The commit stops the timers
and orphan connection cleanup by default for kernel-created
sockets after sock_release is called. ksocklnd relies on Linux
TCP orphan connection cleanup and this commit changes ksocklnd
socket creation to increment sk_net_refcnt on each socket it
creates and to register each socket with the namespace for
proper orphan connection management.

The upstream Linux commit has been backported to various Linux
distributions including Amazon Linux 2 kernels 4.14 and 5.10.

Test-Parameters: trivial
Signed-off-by: Mark Roper <ropermar@amazon.com>
Change-Id: Ib70ba8fcc3f1e49d3afbe788fccd777d02ec39b8
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/56089
Reviewed-by: Timothy Day <timday@amazon.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>