Drop unused remnants of the hosts-config bits

Hosts entries are used to be configured via tripleo_ansible's
tripleo_hosts_entries.

Ifd4bc4ce5618587c341ecbf37f82777ae6fc2f4a removed the use
of WRITE_HOSTS, which currently makes hosts-config.yaml "headless" and
taking no real data for the hosts-config.sh template that generates
outputs for OS::TripleO::Hosts::SoftwareConfig.

Also I606e0f27f9f9ae9d85bc0fc653f8985eb734d004 removed the use of
HOST_ENTRY, which makes the hosts-config.sh taking an empty value for
it.

Probably that all makes it safe now to remove any use of
hosts-config.sh and hosts-config.yaml and corresponding
OS::TripleO::Hosts::SoftwareConfig completely.

Change-Id: Id04767ae0c32caf62271cf564608350974fefd1b
Signed-off-by: Bogdan Dobrelya <bdobreli@redhat.com>

common/deploy-steps.j2

@@ -404,7 +404,6 @@ outputs:
       container_puppet_script: {get_file: ./container-puppet.sh}
       all_nodes_validation_script.sh : {get_file: ../validation-scripts/all-nodes.sh}
       deploy-artifacts.sh : {get_file: ../puppet/deploy-artifacts.sh}
-      hosts-config.sh: {get_file: ../scripts/hosts-config.sh}
       generate-config-tasks: {get_file: generate-config-tasks.yaml}
       host-container-puppet-tasks: {get_file: host-container-puppet-tasks.yaml}
       deploy_steps_playbook:

overcloud-resource-registry-puppet.j2.yaml

@@ -5,7 +5,6 @@ resource_registry:
   OS::Heat::StructuredDeployment: config-download-structured.yaml
   OS::TripleO::PostDeploySteps: common/post.yaml
   OS::TripleO::AllNodesDeployment: OS::Heat::None
-  OS::TripleO::Hosts::SoftwareConfig: hosts-config.yaml
   OS::TripleO::DefaultPasswords: default_passwords.yaml
   OS::TripleO::RandomString: OS::Heat::RandomString