Add support for metadata on robot accounts

Fixes https://jira.coreos.com/browse/QUAY-847
Fixes https://jira.coreos.com/browse/QUAY-816

endpoints/api/robot_models_interface.py

@@ -41,6 +41,7 @@ class RobotWithPermissions(
     'created',
     'teams',
     'repository_names',
+    'description',
   ])):
   """
   RobotWithPermissions is a list of robot entries.
@@ -49,7 +50,7 @@ class RobotWithPermissions(
   :type created: datetime|None
   :type teams: [Team]
   :type repository_names: [string]
-
+  :type description: string
   """
 
   def to_dict(self):
@@ -58,7 +59,8 @@ class RobotWithPermissions(
       'token': self.password,
       'created': format_date(self.created) if self.created is not None else None,
       'teams': [team.to_dict() for team in self.teams],
-      'repositories': self.repository_names
+      'repositories': self.repository_names,
+      'description': self.description,
     }
 
 
@@ -67,22 +69,31 @@ class Robot(
     'name',
     'password',
     'created',
+    'description',
+    'unstructured_metadata',
   ])):
   """
   Robot represents a robot entity.
   :type name: string
   :type password: string
   :type created: datetime|None
-
+  :type description: string
+  :type unstructured_metadata: dict
   """
 
-  def to_dict(self):
-    return {
+  def to_dict(self, include_metadata=False):
+    data = {
       'name': self.name,
       'token': self.password,
       'created': format_date(self.created) if self.created is not None else None,
+      'description': self.description,
     }
 
+    if include_metadata:
+      data['unstructured_metadata'] = self.unstructured_metadata
+    
+    return data
+
 
 @add_metaclass(ABCMeta)
 class RobotInterface(object):