Render console method specification more straightforward

Require user indicate 'console.method' rather than trying to guess.
Notably, console.method might not be desired in a configuration
that wishes only to use remote video.

confluent/pluginapi.py

@@ -69,8 +69,7 @@ class PluginRoute(object):
 noderesources = {
     '_console': {
         'session': PluginRoute({
-            'pluginattrs': ['console.method', 'hardwaremanagement.method'],
-            'default': 'ipmi',
+            'pluginattrs': ['console.method'],
         }),
     },
     'console': {