Add validation to logging templates
Add validation to logging templates

This adds a simple validation that checks that the required outputs
are present in the templates for logging to stdout or files. It also
disables checking the usual required parameters (EndpointMap,
ServiceNetMap, etc.) since these are not used.

bp logging-stdout-rsyslog

Change-Id: I1d7d0faa5f9488cfba08107fc87ecd213f07d063

dprince/tripleo-heat-templates,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates