A TCP server has to take into consideration, if TCP_NOOPT is preventing
the negotiation of TCP features. This affects most TCP options but
adherance to RFC7323 with the timestamp option will prevent a session
from getting established.
PR: 253576
Reviewed By: tuexen, transport
MFC after: 3 days
Sponsored by: NetApp, Inc.
Differential Revision: https://reviews.freebsd.org/D28652