MFC 298618,298620,298688,298689

298618
    hyperv/stor: Set description properly in probe devmethod

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC

298620
    hyperv/hn: Change description to "Hyper-V Network Interface"

    This is consistent w/ other Hyper-V devices.

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC

298688
    hyperv/hn: Restart sending earlier once we gathered some free TX descs

    This greatly reduces the oqdrops under heavy workload.

    For TCP send/recv test (10K concurrent connections):
    oqdrops is reduced by 17% on sending side, and 57% on receiving side.

    For nginx-1.8/wrk-4 1KB object test (10K concurrent connections,
    4 requests/connection):
    oqdrops is reduced by 44% on nginx side, and 10% on wrk side.

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC

298689
    hyperv/hn: Remove unapplied comment.

    Chimney sending buffers are shared across channels.

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC

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