MFC 304204-304206,304252-304256

MFC 304204-304206,304252-304256

304204
    hyperv/hn: Factor out hn_nvs_send/hn_nvs_send_sglist

    Avoid unnecessary message type setting and centralize the send context
    to transaction id cast.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7500

304205
    hyperv/hn: Simplify RNDIS NVS message sending.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7501

304206
    hyperv/hn: Simplify RNDIS message checks on RX path.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7502

304252
    hyperv/hn: Ignore the useless TX table.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7514

304253
    hyperv/hn: Simplify RNDIS RX packets acknowledgement.

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7515

304254
    hyperv/hn: Remove reference to nvsp_msg

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7516

304255
    hyperv/hn: Remove reference to nvsp_status

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7517

304256
    hyperv/hn: Get rid of unused bits

    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D7518

git-svn-id: svn://svn.freebsd.org/base/stable/10@307167 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f