Revert r272128:
  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
Forced commit to reflect the real 10.1-BETA3 point.

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