LU-12678 socklnd: initialize the_ksocklnd at compile-time.

LU-12678 socklnd: initialize the_ksocklnd at compile-time.

All other lnds initialize this struct at compile-time.
It is best for socklnd to do so too.

Test-Parameters: trivial testlist=sanity-lnet

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I3acd636f6f5ba783a2c60bf18ffc46c98e091c13
Reviewed-on: https://review.whamcloud.com/36831
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>