This introduce needed changes to be able to deploy an additional
cell via oooq. If additional_cell is set to true after the
overcloud got deployed the additional cell gets deployed. Todo
this information gets extracted from the overcloud stack, which
is requried as input to the second heat stack, where the additional
cell is managed with. As a reference [1] is the scenario which
is installed adding a single additional cell.
config/general_config/featureset063.yml is used for the configuration
and config/nodes/1ctlr_1cellctrl_1comp.yml has a nova config
example.
[1] https://docs.openstack.org/project-deploy-guide/tripleo-docs/latest/features/deploy_cellv2_basic.html
Depends-On: https://review.opendev.org/691688
Depends-On: https://review.opendev.org/704661
Change-Id: I2de781fcec64e862bde34929547b578d2af0c16c
5b6d26c821