make ari-stubs so doc periodic jobs can run

The periodic doc job does a make ari-stubs and checks that
there are no changes before generating the docs.  Since I changed
the mustache template (and the generated code directly) recently
and forgot to regenerate the stubs, the doc job thinks they're out
of date.

Change-Id: I94b97035311eccf52b0101b8590223265a7881d4