beta: let jenkins-deploy restart Parsoid

On the beta cluster, the Parsoid daemon runs on a dedicated instance
deployment-parsoid2.pmtpa.wmflabs.  The code is updated on
deployment-bastion using the jenkins-deploy user, we then need to
restart the parsoid daemon, that is going to be done via ssh from the
bastion to parsoid2 as user jenkins-deploy.

The sequence is roughly:

 script on deployment-bastion as jenkins-deploy
 ssh jenkins-deploy2@deployment-parsoid2
 > sudo -u parsoid /etc/init.d/parsoid restart

The deployment-parsoid2 already has the role::parsoid::beta class.

bug: 57233
Change-Id: Ie1d4c35a12fbc30b622f0754bf2956f55598844c
Merge "beta: let jenkins-deploy restart Parsoid" into production