Revert "[workaround] Set region for packtack jobs explicitely"
Revert "[workaround] Set region for packtack jobs explicitely"

This reverts commit e58827986beb4bf3805b003e6ebf03de168b8a36.

Since according to https://bugzilla.redhat.com
/show_bug.cgi?id=1716434#c9 fix has (allegedly)
landed since puddle 2019-06-17.2.

Change-Id: Ic55c07e9529acda2c7a6c96e06947ba097dbdf2b

redhat-openstack/infrared,redhat-openstack/infrared,redhat-openstack/infrared