hyperv/stor: Disable invalid disk filtering on non-win10 or non-win 2016

[honzhan_microsoft.com]

Summary

Invalid disk filtering is introduced for fixing the multiple disk issue
on windows 10 and window 2016 server.
See the bug: https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=206630

But it has issue when hot add/remove disk since the filter is not
always correct. In order to catch the FreeBSD 10.3 release on Azure,
the work around is temporarily disable this fix for win2012 R2.

The finally fix is still under investigation.

Submitted by: Hongjiang Zhang <honzhan microsoft com>

[sepherosa_gmail.com]

Looks good to me. Some nits, see below.

sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c

36

Heh, we don't want to change this :)

239

We probably don't need this; use nitems() instead.

2084

Maybe add XXX mark here? So that we can find it easily :)

sys/dev/hyperv/storvsc/hv_vstorage.h

28

Seem pretty accidental; but we have to skip this kind of changes.

[honzhan_microsoft.com]

sys/dev/hyperv/storvsc/hv_storvsc_drv_freebsd.c

36

Just ignore this. This happens because I copied the same file from svn.

239

Thanks. nitems is just what I want.

2084

Ok.

sys/dev/hyperv/storvsc/hv_vstorage.h

28

Yes, ignore this.

[sepherosa_gmail.com]

Let's wait a bit for other reviewers.