Disable devstack plugin for builder 'ironic-grenade'
Disable devstack plugin for builder 'ironic-grenade'

Disable the devstack plugin for items which use the 'ironic-grenade'
builder as the grenade plugin in Ironic already enables the devstack
plugin. If the devstack plugin is enabled twice it gets run twice
which will have it attempting to create the bare-metal VMs twice and
failing.

Change-Id: I75ca21804891b91a928bdafe9146e27eae425f63

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