MFC 320184

MFC 320184

    hyperv/storvsc: Reduce log verbosity

    On some windows hosts TEST_UNIT_READY command will return
    SRB_STATUS_ERROR and sense data "NOT READY asc:3a,1 (Medium
    not present - tray closed)", this occurs periodically, and
    not hurt anything else.  So, we prefer to ignore this kind
    of errors.

    PR:             219973
    Submitted by:   Hongjiang Zhang <hongzhan microsoft com>
    Sponsored by:   Microsoft
    Differential Revision:  https://reviews.freebsd.org/D11271

git-svn-id: svn://svn.freebsd.org/base/stable/10@320348 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f