config: add host-specific ceph_conf_overrides evaluation and generation. #2353
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This allows us to use host-specific variables in ceph_conf_overrides variable. For example, this fixes usage of such variables (e.g. 'nss db path' having {{ ansible_hostname }} inside) in ceph_conf_overrides for rados gateway configuration (see profiles/rgw-keystone-v3) - issue #2157.
Signed-off-by: Eduard Egorov eduard.egorov@icl-services.com
(cherry picked from commit 93e9f37)