Signed-off-by: Rajat Chopra <rchopra@redhat.com>

This commit removes some items from openshift_facts
for the openshit_node role.

This commit removes openshift.common.service_type
in favor of openshift_service_type.

This commit also removes r_openshift_excluder_service_type
from plays in favor of using the role's defaults.

Commit 7f805f9a0c41477365dd88b0ac73f0d221bd654a causes the behavior seen in
https://bugzilla.redhat.com/show_bug.cgi?id=1453113 because openshift-node
is no longer restarted when openvswitch is, due to the change from Requires
to Wants.

Turns out that making the openshift node service PartOf the OVS service
can achieve the same result and ensure openshift-node gets restarted whenever
OVS does, which ensures that networking doesn't break underneath the node.

Suggested by Giuseppe Scrivano

Currently, openshift-anisble supports authentication to
container registries to pull down openshift container images.
The openshift_verison role uses the docker cli to gather
image information from container registries before authentication
credentials are provided by openshift-ansible.

This commit creates the necessary token to authenticate to
private registries during openshift_version.  The token
is generated by the role 'docker' on all hosts where
docker is installed/configured when oreg_auth_users
is defined.

This commit also adds a read-only mount into the
openshift master and node container services.  This
mount is '/var/lib/origin/.docker:/root/.docker:ro'.
This is because the container images do not currently
read the values in '/var/lib/origin/.docker' as this
may be a bug upstream.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1316341

Most of this role's purpose was to set facts.  The vast majority
of these facts were simply redefining user-supplied variables.

This commit also removes various artifacts leftover from
previous versions, as well as variables that seem to be
entirely unused.