DragonFly 5.6.2 tagged

[Justin Sherrill]

I tagged 5.6.2 and built it this morning:

http://lists.dragonflybsd.org/pipermail/commits/2019-August/719259.html

It includes the recent tcp keepalive changes and some other work.
You'll want to update dports, too.

I'm uploading the 5.6.2 image as I type.  You can rebuild using the
normal process on an existing 5.6.0 or 5.6.1 system:

> cd /usr/src
> git pull
> make buildworld
> make buildkernel
> make installkernel
> make installworld
> make upgrade

and of course

> pkg upgrade