startjail.sh ignores the MTU of the external interface when creating the
epairNb device.

Ticket: #4797
Do not report replication in alert system if result is None

(cherry picked from commit 2f602bf1babfa62a2fa48861e39ce957fd9e019b)
LUN ID is per target, make it so.

(cherry picked from commit 04f82991f8c366946f5f42b8055ee1d2146b596a)
Remove the virtualbox kernel modules again; cyberjock has proven that
the kernel modules actually have to be shipped with the virtualbox-ose package
(or template or plugin) since the ABI contract is so loose that these kernel
modules can and will refuse to work with any given virtualbox version.  Since
users have to manually replace these modules anyway, there's not much point in
shipping them.

Conflicts:
	nanobsd/os-ports
Whooops, this shouldn't have made it over from master.  Nuke it.
Remove virtualbox as obsolete.
Preserve /boot/loader.conf.local across upgrades.

Ticket: #4798
(cherry picked from commit a4c8e5650f28350db3b4aaca09f6b72dde6b653c)
Merge remote-tracking branch 'origin/9.2.1-BRANCH' into feature/hyperv