Bug 1341176

This enhancement adds support for deploying RT enabled compute nodes from director alongside "regular" compute nodes. 1. Based on tripleo-heat-templates/environments/compute-real-time-example.yaml, create a compute-real-time.yaml environment file that sets the parameters for the ComputeRealTime role with at least the correct values for: * IsolCpusList and NovaVcpuPinSet: a list of CPU cores that should be reserved for real-time workloads. This depends on your CPU hardware on your real-time compute nodes. * KernelArgs: set to "default_hugepagesz=1G hugepagesz=1G hugepages=X" with X depending on the number of guests and how much memory they will have. 2. Build and upload the overcloud-realtime-compute image: * Prepare the repos (for CentOS): - sudo yum install -y https://trunk.rdoproject.org/centos7/current/python2-tripleo-repos-XXX.el7.centos.noarch.rpm - sudo -E tripleo-repos current-tripleo-dev - export DIB_YUM_REPO_CONF="/etc/yum.repos.d/delorean* /etc/yum.repos.d/quickstart*" * openstack overcloud image build --image-name overcloud-realtime-compute --config-file /usr/share/openstack-tripleo-common/image-yaml/overcloud-realtime-compute.yaml --config-file /usr/share/openstack-tripleo-common/image-yaml/overcloud-realtime-compute-centos7.yaml * openstack overcloud image upload --update-existing --os-image-name overcloud-realtime-compute.qcow2 3. Create roles_data.yaml with ComputeRealTime and all other required roles, for example: `openstack overcloud roles generate -o ~/rt_roles_data.yaml Controller ComputeRealTime ...` and assign the ComputeRealTime role to the real-time nodes in one of the usual ways. See https://docs.openstack.org/tripleo-docs/latest/install/advanced_deployment/custom_roles.html 4. Deploy the overcloud: openstack overcloud deploy --templates -r ~/rt_roles_data.yaml -e ./tripleo-heat-templates/environments/host-config-and-reboot.yaml -e ./compute-real-time.yaml [...]