Merge pull request #5384 from joelddiaz/node-fact-filter

Automatic merge from submit-queue

move (and rename) get_dns_ip filter into openshift_node_facts

Due to recent changes to filter_plugins/openshift_node.py, when trying to run a current version of the openshift_node_facts role on a system with an older version of the openshift-ansible-filter-plugins RPM, the new role will fail.
```
  File "/usr/share/ansible_plugins/filter_plugins/openshift_node.py", line 30, in get_dns_ip
    if bool(hostvars['openshift']['common']['use_dnsmasq']):
KeyError: 'use_dnsmasq'
```
It's not possible for us to have our current RPM version (presently openshift-ansible-filter-plugins-3.5.120-1.git.0.c60f69a.el7.noarch) and a newer RPM installed and run both current openshift-ansible code and older checked-out/vendored releases (for older clusters/releases).

Since only the openshift_node_facts role uses the get_dns_ip filter, move the functionality into a role-specific filter plugin.

In addition, rename the filter plugin to 'node_get_dns_ip' because Ansible is preffering the get_dns_ip from the RPM (ie /usr/share/ansible_plugins/filter_plugins/openshift_node.py) over the role-specific filter plugin of the same name. Ansile prefers the filter plugins in /usr/share/ansible_plugins/filter_plugins/* even when /etc/ansible/ansible.cfg is set to something like:

filter_plugins     = filter_plugins:/usr/share/ansible_plugins/filter_plugins:filter_plugins   <--- yes, 'filter_plugins' before and after /usr/share/ansible_plugins/filter_plugins (ansible 2.3.1.0) (perhaps this is because the /usr/share/ansible/plugins/filter symlink to /usr/share/ansible_plugins/filter_plugins takes precedence over everything???)

Renaming the filter plugin function ensures that versions of the openshift_node_facts role that depend on the old implementation can continue to use it through what the older RPM provides, and the new role can use it's role-specific filter plugin without any variable namespace collisions.

Lastly, remove filter_plugins/openshift_node.py since it is now self-contained in roles/openshift_node_facts.

https://bugzilla.redhat.com/show_bug.cgi?id=1494312

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