Comment out the syncache's test which ensures that hosts which negotiate TCP

Comment out the syncache's test which ensures that hosts which negotiate TCP
timestamps in the initial SYN packet actually use them in the rest of the
connection.  Unfortunately, during the 7.0 testing cycle users have already
found network devices that violate this constraint.

RFC 1323 states 'and may send a TSopt in other segments' rather than
'and MUST send', so we must allow it.

Discovered by: Rob Zietlow
Tracked down by: Kip Macy
PR: bin/118005