REPO-1206: added 400 and 401 responses common to "retrieve action list" operations
REPO-1206: added 400 and 401 responses common to "retrieve action list" operations

 For:
 /nodes/{nodeId}/action-definitions
 /action-definitions

Alfresco/rest-api-explorer,Alfresco/rest-api-explorer,Alfresco/rest-api-explorer