Add custom_undercloud_roles_data. Defaults to t-h-t's
/roles_data_undercloud.yaml. Defines a custom undercloud roles
data file which should be taken into account when
preparing docker images for containerized undercloud services
deployment. The default can not be changed yet as it is hardcoded
in the tripleo client.
Related-bug: #1693448
Change-Id: I38bd7beefa59ef56f6f4df91715a808d4b8c228e
Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>
54e54f043a