Add `value` parameter to SOMAXCONN binding
Add `value` parameter to SOMAXCONN binding

Problem spotted by yallop in
https://github.com/moby/vpnkit/commit/8d718125a66fbe746ba17ad3e85b7924ac0ed9a4#commitcomment-21930309

Signed-off-by: David Scott <63c9eb0ea83039690fefa11afe17873ba8278a56@docker.com>

djs55/vpnkit,djs55/vpnkit,djs55/vpnkit