Currently, policy.json is put in
"{{ node_config_directory }}/{{ service_name }}"
in target nodes.
Relocation policy.json to "{{ node_config_directory }}/{{ item }}"
with item is corresponding service compoment config directory.
Currently, the policy.json is copied to all services, but it
should be reviewed and left only in neccesary service
(at many cases, only API service needs that).
Redundant files will be removed in follow up patchset.
Change-Id: I0e997dccf4ec438c9c0436db71ec2fd06650f50d
Closes-Bug: #1639686
Allow operators to use their custom policy files.
Avoid maintain policy files in kolla repos, only copying
the files when an operator add their custom config.
Implements: blueprint custom-policies
Change-Id: Icf3c961b87cbc7a1f1dd2ffbfffcf271d151d862
