First of all, we're using RST syntax, so rename it to README.rst.
More importantly, remove menitons of puppetmaster - and puppet in
general, as they are distracting. When reading the file, my eyes
scanned and hit puppetmaster and I almost skipped the section with the
assumption it was out of date.
Change-Id: I294bf17084be7dad46e075ad2a3ef2674276c018
