Add overcloud-ceph image build yaml

Added image yaml config files to build an overcloud-ceph image that does
not have the HA, openvswitch or openstack client related packages
installed by default. This image is useful for dedicated ceph nodes that
do not have any openstack related services on them.

Change-Id: I4e14a49c428b8b7530f49218b413c795e777851b

image-yaml/overcloud-images-ceph-centos8.yaml

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+disk_images:
+  -
+    imagename: overcloud-ceph
+    type: qcow2
+    distro: centos
+    release: 8
+    elements:
+      - selinux-permissive

image-yaml/overcloud-images-ceph-rhel8.yaml

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+disk_images:
+  -
+    imagename: overcloud-ceph
+    type: qcow2
+    distro: rhel8
+    release: 8

image-yaml/overcloud-images-ceph.yaml

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+disk_images:
+  -
+    imagename: overcloud-ceph
+    type: qcow2
+    elements:
+      - baremetal
+      - dhcp-all-interfaces
+      - overcloud-agent
+      - overcloud-base
+      - overcloud-ceph-storage
+      - puppet-modules
+      - stable-interface-names
+      - grub2
+      - element-manifest
+      - dynamic-login
+      - iptables
+      - enable-packages-install
+      - override-pip-and-virtualenv
+      - dracut-regenerate
+      - remove-machine-id
+      - remove-resolvconf
+      - openssh
+      - disable-nouveau
+    packages:
+      - python3-psutil
+      - python3-debtcollector
+      - sos
+      - device-mapper-multipath
+      - openstack-heat-agents
+      - os-net-config
+      - jq
+      - python3-dbus
+    environment:
+      FS_TYPE: xfs
+      DIB_PYTHON_VERSION: '3'
+    options:
+      - "--mkfs-options '-s size=4096'"
+      - "--min-tmpfs=7"

releasenotes/notes/add-overcloud-ceph-image-build-yamls-8ad8fe8b013a314e.yaml

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+---
+features:
+  - |
+    Added `overcloud-images-ceph.yaml`, `overcloud-images-ceph-centos8.yaml`,
+    and `overcloud-images-ceph-rhel8.yaml` to allow an operator to build an
+    image that can be used for dedicated ceph nodes. This `overcloud-ceph`
+    image would not have the openstack client, ha or openvswitch related
+    packages.