MFC 309320,309726,309728

MFC 309320,309726,309728

309320
    hyperv/storvsc: Don't use timedwait.

    The timeout is unnecessary.

    Reviewed by:    jhb
    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8656

309726
    hyperv/storvsc: Fix the SCSI disk attachment issue.

    On pre-WS2016 Hyper-V, if the only LUNs > 7 are used, then all disks
    fails to attach.  Mainly because those versions of Hyper-V do not set
    SRB_STATUS properly and deliver junky INQUERY responses.

    Submitted by:   Hongjiang Zhang <honzhan microsoft com>
    Reported by:    Hongxiong Xian <v-hoxian microsoft com>
    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D8724

309728
    hyperv/storvsc: Minor style changes; no functional changes.

    Reported by:    rpokala
    Sponsored by:   Microsoft

git-svn-id: svn://svn.freebsd.org/base/stable/10@310769 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f