Currently, having openshift_node and openshift_node_upgrade
as two distinct roles has created a duplication across
handlers, templates, and some tasks.

This commit combines the roles to reduce duplication
and bugs encountered by not putting code in both places.

Currently, the command 'docker login' is run when using
oreg with authentication.

On some hosts, such as hosts configured to use system containers,
the docker service is not running.  'docker login' will fail
without the docker service running.

This commit adds a module to idempotently add credentials
to the registry credentials file without the use of
'docker login'

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1511374

Currently, debug_level is documented as a way to change
the debug output level for both masters and nodes.

debug_level does not currently have any effect.

This commit removes debug_level from openshift_facts
and properly sets openshift_master_debug_level and
openshift_node_debug_level to the value of debug_level
specified in the inventory.

This commit also reorganizes some set_fact tasks
needed during master upgrades to put all work-around
set-facts for undefined variables in one place, allowing
for easier cleanup in the future.  This includes an
entry for openshift_master_debug_level.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1500164

Currently, the logic for registry authentication is
not implemented correctly to account for upgrades of
containerized hosts.

Additionally, the logic to account for multiple runs
of openshift-ansible might cause registry authentication
credentials to not be mounted inside of containerized hosts.

This commit adds the necessary logic to ensure containerized
hosts retain registry credentials.

Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1494470

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.