MFC r263259
    Add Tx/Rx multiqueue support to vmx(4)

    As a prerequisite for multiple queues, the guest must have MSIX enabled.
    Unfortunately, to work around device passthrough bugs, FreeBSD disables
    MSIX when running as a VMWare guest due to the hw.pci.honor_msi_blacklist
    tunable; this tunable must be disabled for multiple queues.

    Also included is various minor changes from the projects/vmxnet branch.

MFC r264865
    Update the date that was missed in r263259