LU-13641 socklnd: remove tcp bonding

LU-13641 socklnd: remove tcp bonding

TCP bonding in the socklnd has become obsolete with LNet
Multi-Rail and there's no evidence it's being used anywhere.
Remove it to keep the code simple.

Lustre-change: https://review.whamcloud.com/40000
Lustre-commit: d123c47a18adbf5665ed63d99c53117b84db9ec8

Test-Parameters: trivial testlist=sanity-lnet
Signed-off-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Change-Id: Ib456f951b8ccd59112c460085632a2cb3c982004
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/44326
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Amir Shehata <ashehata@whamcloud.com>