Deploy command:

openstack overcloud deploy --templates /usr/share/openstack-tripleo-heat-templates \
-e /usr/share/openstack-tripleo-heat-templates/environments/network-isolation.yaml \
-e /usr/share/openstack-tripleo-heat-templates/environments/network-management.yaml \
-e /usr/share/openstack-tripleo-heat-templates/environments/storage-environment.yaml \
-e ~/openstack_deployment/environments/enable-cpu-pinning.yaml \
-e ~/openstack_deployment/environments/nodes.yaml \
-e ~/openstack_deployment/environments/network-environment.yaml \
-e ~/openstack_deployment/environments/disk-layout.yaml \
-e ~/openstack_deployment/environments/scheduler_hints_env.yaml \
-e ~/openstack_deployment/environments/ips-from-pool-all.yaml \
-e ~/openstack_deployment/environments/neutron-settings.yaml \
-e ~/openstack_deployment/environments/custom_hiera.yaml \


customization enviroment file:

~/openstack_deployment/environments/enable-cpu-pinning.yaml

[stack@undercloud-0 ~]$ cat ~/openstack_deployment/environments/enable-cpu-pinning.yaml
resource_registry:
  OS::TripleO::Tasks::ComputePostConfig: update-grub.yaml

parameter_defaults:
  # Replace device with the name of the device that contains the boot record, usually sda. 
  compute_root_disk: '/dev/vda'

  # Use the list of CPU cores reserved for guest processes as a parameter of this argument.
  compute_isol_cpu: '1'

  ControllerExtraConfig:
    nova::scheduler::filter::scheduler_default_filters: ['RetryFilter' , 'AvailabilityZoneFilter' , 'RamFilter' , 'ComputeFilter' , 'ComputeCapabilitiesFilter' , 'ImagePropertiesFilter' , 'CoreFilter' , 'NUMATopologyFilter' , 'AggregateInstanceExtraSpecsFilter' ]

  NovaComputeExtraConfig:
    nova::compute::vcpu_pin_set: [ '1' ]
    nova::compute::reserved_host_memory: '1024'


[stack@undercloud-0 ~]$ cat ~/openstack_deployment/environments/update-grub.yaml 
heat_template_version: 2014-10-16

description: >
  Extra hostname configuration

parameters:
  servers:
    type: json
  compute_root_disk:
    type: string
  compute_isol_cpu:
    type: string
  input_values:
    type: json
    description: input values for the software deployments

resources:
  ExtraConfig:
    type: OS::Heat::SoftwareConfig
    properties:
      group: script
      config:
        str_replace:
          template: |
            #!/bin/bash
            if ! `cat /proc/cmdline  | grep -q isolcpus`;then
            grubby --update-kernel=ALL --args="isolcpus=_ISOL_CPU_"
            grub2-install _ROOT_DISK_
            fi
          params:
            _ROOT_DISK_: {get_param: compute_root_disk}
            _ISOL_CPU_: {get_param: compute_isol_cpu}

  ExtraDeployments:
    type: OS::Heat::SoftwareDeployments
    properties:
      servers:  {get_param: [servers, 'Compute']}
      config: {get_resource: ExtraConfig}
      actions: ['CREATE','UPDATE']
      input_values: {get_param: input_values}

Both fixes are merged/backported

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:2086