LU-13510 lnd: Allow independent socklnd timeout

LU-13510 lnd: Allow independent socklnd timeout

Allow the socklnd timeout to be set independent of
lnet_transaction_timeout and retry_count.

Signed-off-by: Chris Horn <hornc@cray.com>
Change-Id: Iaa76e77990c8c5ce79193ae8d1f7b3a7db6b433f
Reviewed-on: https://review.whamcloud.com/38460
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>