HAT: reinstall mw1053 with trusty

This change is the first in a series that will re-purpose mw1053 as the
first HHVM jobrunner

Change-Id: I2bdc7d972a09daf9d7eb6a9cda6a2d42c9c28af2
Signed-off-by: Giuseppe Lavagetto <glavagetto@wikimedia.org>