zuul/layout: run intergation jobs on puppet-mistral
zuul/layout: run intergation jobs on puppet-mistral

Mistral is now deployed in scenario002 of Puppet OpenStack
Integration testing, and we run Tempest.
This patch runs the jobs for puppet-mistral.

Depends-On: Ia43427cc207ee5b7b95e9610f06a568992fb58cd
Change-Id: Ibc2829d55624d0b2f305d867e129bc1a90a46302

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