LU-10391 ksocklnd: use ksocknal_protocol v4 for IPv6

LU-10391 ksocklnd: use ksocknal_protocol v4 for IPv6

During testing of IPv6 I encountered the following error:

LNetError: 11c-c: Protocol error connecting to ...

This was due to the ksocklnd protocol not being set to the correct
version when using IPv6 addresses. Test if we have a IPv6 peer and
set the proper protocol.

Test-Parameters: trivial testlist=sanity-lnet
Change-Id: I19183e904acee4cb8b9d3b7e77284c81f6cdc2b4
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/52911
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Cyril Bordage <cbordage@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>