Disable Mitaka Horizon dj19 test
Disable Mitaka Horizon dj19 test

The Horizon Django 1.9 tests were recently made voting[1], but were not
disabled for stable/mitaka, causing the gate to be blocked.

1. https://review.openstack.org/#/c/305940/

Change-Id: I2e4145838e75d89492bac72ffd737f236171f0b0

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