Revert "Disable ATS for now.  It makes vmware unhappy."

This reverts commit f620c284315fa87e69150c16c6d31c5e76b95d7e.

(cherry picked from commit db22d7675a12ea008ad516c7fa0bda233bb8d9fe)
Work around buggy ATS implimentation in vmware.

Patch objained from mav@

Code has not been upstreamed into FreeBSD at the time of this commit.

Ticket: #5257
(cherry picked from commit 11a9ebadc690a375eeb287a8bd7b658b61a592d9)