Move ocata VCP nodes to preconfigured cloudinit images

VCP nodes require the preconfigured image because of reduced
mirrors that miss some packages.

Change-Id: I2bf119f5338ee50308fdaa1d28d86df318012037
diff --git a/tcp_tests/templates/virtual-mcp-ocata-ceph-offline/underlay.yaml b/tcp_tests/templates/virtual-mcp-ocata-ceph-offline/underlay.yaml
index 34760e5..239d8ba 100644
--- a/tcp_tests/templates/virtual-mcp-ocata-ceph-offline/underlay.yaml
+++ b/tcp_tests/templates/virtual-mcp-ocata-ceph-offline/underlay.yaml
@@ -172,6 +172,12 @@
          - name: cfg01_day01_image               # Pre-configured day01 image
            source_image: {{ os_env('IMAGE_PATH_CFG01_DAY01', os_env('IMAGE_PATH1604')) }} # http://images.mirantis.com/cfg01-day01.qcow2 or fallback to IMAGE_PATH1604
            format: qcow2
+         - name: mcp_ubuntu_1604_image           # Pre-configured image for VCP nodes initially based on kvm nodes.
+           # http://images.mirantis.com/ubuntu-16-04-x64-latest.qcow2  (preffered)
+           # or
+           # https://cloud-images.ubuntu.com/xenial/current/xenial-server-cloudimg-amd64-disk1.img
+           source_image: {{ os_env('MCP_IMAGE_PATH1604', os_env('IMAGE_PATH1604')) }}
+           format: qcow2
 
         nodes:
           - name: {{ HOSTNAME_APT01 }}
@@ -274,7 +280,7 @@
               volumes:
                 - name: system
                   capacity: !os_env NODE_VOLUME_SIZE, 150
-                  backing_store: cloudimage1604
+                  backing_store: mcp_ubuntu_1604_image
                   format: qcow2
                 - name: cinder
                   capacity: 50
@@ -315,7 +321,7 @@
               volumes:
                 - name: system
                   capacity: !os_env NODE_VOLUME_SIZE, 150
-                  backing_store: cloudimage1604
+                  backing_store: mcp_ubuntu_1604_image
                   format: qcow2
                 - name: cinder
                   capacity: 50
@@ -344,7 +350,7 @@
               volumes:
                 - name: system
                   capacity: !os_env NODE_VOLUME_SIZE, 150
-                  backing_store: cloudimage1604
+                  backing_store: mcp_ubuntu_1604_image
                   format: qcow2
                 - name: cinder
                   capacity: 50