MFC: r264469, r264498

MFC: r264469, r264498
Lagg did not set the value of if_hw_tsomax, so when lagg
was stacked on top of network interfaces that set if_hw_tsomax,
tcp_output() would see the default value instead of the value
set by the network interface(s). This patch modifies lagg so that
it sets if_hw_tsomax to the minimum of the value(s) for the
underlying network interfaces.

git-svn-id: svn://svn.freebsd.org/base/stable/10@265412 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f