beta: vary deployment-bastion by ::site

I am recreating the betacluster on eqiad, need to get some hardcoded
deployment-bastion.pmtpa.wmflabs to use 'eqiad'.

Change-Id: I47fbf7576bfc61a35fb032f48db68a64e3b3b0f3
Merge "beta: vary deployment-bastion by ::site" into production