src/contrib/hyperv/tools/scripts, branch releng/10.3

MFC r271493,271688-271689,271696,271854,272139-272143:

2014-09-30T17:54:57+00:00

Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

Approved by:	re (gjb)

Properly revert r272128.

2014-09-26T03:03:58+00:00

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation

Revert r272149, which introduces obscure vestiges from the

2014-09-26T02:30:47+00:00

r272128 reversal.

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation

Revert r272128:

2014-09-26T01:08:31+00:00

  Though this passes the buildworld test, this fails during
  installworld with:

  make[3]: "/releng/scripts-release/chroots/10/i386/release/etc/devd/Makefile"
  line 13: Malformed conditional (${MK_HYPERV} != "no")

Approved by:	re (implicit)
Sponsored by:	The FreeBSD Foundation

MFC r271493,271688,271689,271696,271854:

2014-09-25T20:34:13+00:00

Import HyperV Key-Value Pair (KVP) driver and daemon code by Microsoft,
many thanks for their continued support of FreeBSD.

While I'm there, also implement a new build knob, WITHOUT_HYPERV to
disable building and installing of the HyperV utilities when necessary.

The HyperV utilities are only built for i386 and amd64 targets.

Approved by:	re (gjb)