trigger for operations-puppet-rspec (non voting)

operations-puppet-rspec is an experimental job which invokes 'rake spec'
at the root of the repository.  Since rspec is not very safe, I have add
to introduce a test pipeline which runs unsafe tests and will vote +2.

That means untrusted people will only receive verified +1 and not have
rspec job run for them.  A trusted person can trigger them by amending
the commit summary.

Change-Id: I83407e41c0b3ce529dfec74ef7cf232ff05c6929