LU-10391 lnet: support setting LND timeouts

LU-10391 lnet: support setting LND timeouts

The patch that added support for NI setup with Netlink was
developed before individual LND timeout settings support was
merged. Add this missing settings. For ksocklnd we already
supported conns_per_peer so rearrange the code into a switch
statement.

Test-Parameters: trivial testlist=sanity-lnet
Fixes: 8f8f6e2f36e ("LU-10003 lnet: use Netlink to support old and new NI APIs.")
Change-Id: Iba955da7f5fa78b8a624bab6af66b577c75917e0
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/53013
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>