Provides a list of per-service ctlplane IPs to the workflows env

Provides a list of per-service ctlplane IPs to the workflows env

Adds in the execution environment of the workflow steps a list of
per-service network IPs. This can be used by the workflows to
execute actions against the nodes hosting a given service.

Change-Id: Id7c735d53f04f6ad848b2f9f1adaa3c84ecd2fcd
Implements: blueprint tripleo-ceph-ansible