vmm/hyperv: code cleanup of utility drivers

[howard0su_gmail.com]

Summary

1. give right driver name for devices, instead of hvutilx
2. move global data into driver softc structure

kvp code cleanup will submit as a separate code review.

[howard0su_gmail.com]

Update hv_kvp driver using new hv_util functions

[howard0su_gmail.com]

Fix hv_kvp and also cleanup a bit.

[howard0su_gmail.com]

Cleanup KVP driver to remove all global variables.

[honzhan_microsoft.com]

Since there are some new added files, shall we modify the copyright to "2016"? I remember Sephie said there are some regulations on copyright.

sys/dev/hyperv/utilities/hv_heartbeat.c

3

Shall we update it to be "2016 Microsoft Corp."?

[sepherosa_gmail.com]

In D5216#112844, @honzhan_microsoft.com wrote:

Since there are some new added files, shall we modify the copyright to "2016"? I remember Sephie said there are some regulations on copyright.

I have not checked the file content yet. However, if majority of the content of the new file is copied from other file, we need to retain the source files copyright.

[howard0su_gmail.com]

In D5216#112847, @sepherosa_gmail.com wrote:

In D5216#112844, @honzhan_microsoft.com wrote:

Since there are some new added files, shall we modify the copyright to "2016"? I remember Sephie said there are some regulations on copyright.

I have not checked the file content yet. However, if majority of the content of the new file is copied from other file, we need to retain the source files copyright.

Most newly added files contains code is copied from original files. I don't think we should change the copyright.

[adrian]

sys/dev/hyperv/utilities/hv_heartbeat.c

3

I'd update it to be 2014, 2016 Microsoft Corp.