MFC 295919,295958,295964

MFC 295919,295958,295964

295919
    hyperv/stor: Fix print format

    Detected by:        PVS Static Analysis
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5388

295958
    hyperv/utils: Code rearrange and cleanup

    Split heartbeat, shutdown and timesync out of utils code
    and name them properly.

    Submitted by:       Jun Su <junsu microsoft com>
    Reviewed by:        adrian, sephe, Hongjiang Zhang <honzhan microsoft com>
    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5216

295964
    hyperv/vmbus: Use free(9) for interrupt page; it is allocated by malloc(9)

    MFC after:  1 week
    Sponsored by:       Microsoft OSTC
    Differential Revision:      https://reviews.freebsd.org/D5417

git-svn-id: svn://svn.freebsd.org/base/stable/10@301866 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f