Revert "Only update nodepool images on Tuesdays"
Revert "Only update nodepool images on Tuesdays"

This reverts commit e474929518a11337a87432a67abd5f0144833551.

Approve once https://bitbucket.org/hpk42/tox/issues/294 is fixed in
a new tox release.

Change-Id: I73846af205efb49e14c41793e0327b54a9f2f7f9

dongwenjuan/project-config,noorul/os-project-config,openstack-infra/project-config,Tesora/tesora-project-config,noorul/os-project-config,dongwenjuan/project-config,openstack-infra/project-config,Tesora/tesora-project-config