Split image.inc across git repos

Currently compiling a new package and adding it
to the iso still requires a multi-git update because
image.inc is a single centralized file in the root git.

It would be better to allow a single git update to add
a package. Too allow this, image.inc must be split across
the git repos and the build tools must be changed to
read/merge those files to arrive at the final package list.

Current scheme is to name the image.inc files using this
schema.

${distro}_${build_target}_image_${build_type}.inc

distro = centos, ...
build_target = iso, guest ...
build_type = std, rt ...

Traditionally build_type=std is omitted from config files,
so we instread use ${distro}_${build_target}_image.inc.

Change-Id: I5055ef6cf5c86a44e70660d2b3507f6ecf22d793
Story: 2003447
Task:  24649
Depends-On: Ib39b8063e7759842ba15330c68503bfe2dea6e20
Signed-off-by: Scott Little <scott.little@windriver.com>

centos_iso_image.inc

@@ -0,0 +1,170 @@
+# List of packages to be included/installed in ISO
+# If these have dependencies, they will be pulled in automatically
+#
+
+# ceph
+ceph
+ceph-common
+ceph-fuse
+ceph-radosgw
+libcephfs1
+python-cephfs
+python-ceph-compat
+
+# ceph-manager
+ceph-manager
+
+# openstack-murano
+openstack-murano-common
+openstack-murano-engine
+openstack-murano-api
+openstack-murano-cf-api
+openstack-murano-doc
+
+# python-muranoclient
+python2-muranoclient
+python-muranoclient-doc
+
+# openstack-murano-ui
+openstack-murano-ui
+openstack-murano-ui-doc
+
+# openstack-ironic
+openstack-ironic-common
+openstack-ironic-api
+openstack-ironic-conductor
+
+# python-ironicclient
+python2-ironicclient
+
+# python-magnumclient
+python2-magnumclient
+python-magnumclient-doc
+python-magnumclient-tests
+
+# openstack-magnum
+python-magnum
+openstack-magnum-common
+openstack-magnum-conductor
+openstack-magnum-api
+openstack-magnum-doc
+python-magnum-tests
+
+# openstack-magnum-ui
+openstack-magnum-ui
+
+# openstack-ras
+openstack-ras
+
+# openstack-ceilometer
+python-ceilometer
+openstack-ceilometer-common
+openstack-ceilometer-notification
+openstack-ceilometer-ipmi
+openstack-ceilometer-polling
+
+# openstack-cinder
+openstack-cinder
+
+# openstack-glance
+openstack-glance
+
+# gnocchi
+python-gnocchi
+gnocchi-api
+gnocchi-common
+gnocchi-metricd
+gnocchi-statsd
+
+# python-gnocchiclient
+python2-gnocchiclient
+
+# openstack-heat
+openstack-heat-common
+openstack-heat-engine
+openstack-heat-api
+openstack-heat-api-cfn
+openstack-heat-api-cloudwatch
+
+# wrs-heat-templates
+wrs-heat-templates
+
+# python-django-horizon
+python-django-horizon
+openstack-dashboard
+
+# openstack-keystone
+openstack-keystone
+
+# python-networking-bgpvpn
+python2-networking-bgpvpn
+python-networking-bgpvpn-dashboard
+python-networking-bgpvpn-heat
+
+# python-networking-sfc
+python2-networking-sfc
+
+# python-networking-odl
+python-networking-odl
+
+# openstack-neutron
+openstack-neutron
+python-neutron
+openstack-neutron-common
+openstack-neutron-ml2
+openstack-neutron-openvswitch
+openstack-neutron-sriov-nic-agent
+
+# python-neutron-dynamic-routing
+python2-neutron-dynamic-routing
+
+# openstack-nova
+openstack-nova-common
+openstack-nova-compute
+openstack-nova-network
+openstack-nova-scheduler
+openstack-nova-api
+openstack-nova-conductor
+openstack-nova-console
+openstack-nova-cells
+openstack-nova-cert
+openstack-nova-novncproxy
+openstack-nova-spicehtml5proxy
+openstack-nova-serialproxy
+openstack-nova-placement-api
+python-nova
+
+# python-novaclient
+python2-novaclient
+
+# distributedcloud
+distributedcloud-dcmanager
+distributedcloud-dcorch
+
+# distributedcloud-client
+distributedcloud-client-dcmanagerclient
+
+# openstack-aodh
+openstack-aodh-compat
+openstack-aodh-api
+openstack-aodh-evaluator
+openstack-aodh-notifier
+openstack-aodh-listener
+openstack-aodh-expirer
+
+# openstack-panko
+python-panko
+openstack-panko-api
+openstack-panko-common
+
+# rabbitmq-server
+rabbitmq-server
+
+# python-openstackclient
+python2-openstackclient
+
+# python-django-openstack-auth
+python2-django-openstack-auth
+
+# python-wsme
+python2-wsme