Add a bootstrap_host_exec CMD

Adds a simple command line utility that will exist in all TripleO
containers (we may need this in a variety of places) so that we
can quickly figure out whether a command should execute on the
bootstrap node (or not).

For example:
  ./bootstrap_host_exec heat_engine heat-manage db_sync

would only execute the DB sync for heat on the bootstrap node.
Internally the script uses hieradata to determine when to run the
supplied command.

Also, adds openstack-tripleo-common to the base container image so we
can use it in a variety of container images.

Related-Bug: #1688380
Change-Id: If25f217bbb592edab4e1dde53ca99ed93c0e146c

container-images/tripleo_kolla_template_overrides.j2

@@ -5,17 +5,14 @@
 {% set base_yum_url_packages_override = [] %}
 {% set base_yum_repo_keys_override = [] %}
 
-{% set base_centos_binary_packages_append = ['puppet'] %}
-{% set nova_scheduler_packages_append = ['openstack-tripleo-common'] %}
-
-# Required for mistral-db-populate to load tripleo custom actions on
-# the undercloud
-{% set mistral_api_packages_append = ['openstack-tripleo-common'] %}
-{% set mistral_engine_packages_append = ['openstack-tripleo-common'] %}
+# add tripleo-common to base packages for the bootstrap_host_exec command
+# tripleo-common is also required by Nova scheduler (for tripleo filters)
+# and Mistral for the Undercloud
+{% set base_centos_binary_packages_append = ['puppet', 'openstack-tripleo-common'] %}
 
 # NOTE: Mistral executor needs to run nova-manage cells_v2 commands on
 # the undercloud baremetal workflows.
-{% set mistral_executor_packages_append = ['openstack-tripleo-common', 'openstack-nova-common'] %}
+{% set mistral_executor_packages_append = ['openstack-nova-common'] %}
 
 # FIXME (kolla review to add ceilometer to swift proxy image)
 {% set swift_proxy_server_packages_append = ['openstack-ceilometer-common'] %}

scripts/bootstrap_host_exec

@@ -0,0 +1,19 @@
+#!/bin/bash
+set -e
+SERVICE_NAME=$1
+if [ -z "$SERVICE_NAME" ]; then
+  echo "Please supply a valid service name."
+  exit 1
+fi
+shift
+if [ -z "$*" ]; then
+  echo "Please supply a valid 'command' to run as an argument."
+  exit 1
+fi
+HOSTNAME=$(/bin/hostname -s)
+SERVICE_NODEID=$(/bin/hiera -c /etc/puppet/hiera.yaml "${SERVICE_NAME}_short_bootstrap_node_name")
+if [[ "$HOSTNAME" == "$SERVICE_NODEID" ]]; then
+  eval $*
+else
+  echo "Skipping execution since this is not the bootstrap node for this service."
+fi