18111 Want C++ header tests
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Approved by: Dan McDonald <danmcd@edgecast.io>

18166 Create header-tests package
Reviewed by: Bill Sommerfeld <sommerfeld@hamachi.org>
Reviewed by: Robert Mustacchi <rm@fingolfin.org>
Approved by: Dan McDonald <danmcd@edgecast.io>