placeholder test files

So... it turns out that the prefix "stub-" is reserved in WPT.  I am not
sure for what, but it is a special class of test files that can't currently
be selected from the UI.  So when I create the empty test files that need
populating, I am going to use the prefix "ph-" for placeholder.

On a related note, the result of NOTRUN in WPT literally means that a test
was created and then nothing was run about it.  I am going to have the ph-*
tests do this so they show up in our reporting but.... I am sure that is
not what NOTRUN was intended for and we might get some pushback from the
powers that be.  Whoever they are.

-- 
Shane McCarron
Projects Manager, Spec-Ops