Add creation date information to robots API and UI

Fixes https://jira.coreos.com/browse/QUAY-846

endpoints/api/robot_models_interface.py

@@ -3,6 +3,8 @@ from collections import namedtuple
 
 from six import add_metaclass
 
+from endpoints.api import format_date
+
 
 class Permission(namedtuple('Permission', ['repository_name', 'repository_visibility_name', 'role_name'])):
   """
@@ -36,6 +38,7 @@ class RobotWithPermissions(
   namedtuple('RobotWithPermissions', [
     'name',
     'password',
+    'created',
     'teams',
     'repository_names',
   ])):
@@ -43,6 +46,7 @@ class RobotWithPermissions(
   RobotWithPermissions is a list of robot entries.
   :type name: string
   :type password: string
+  :type created: datetime|None
   :type teams: [Team]
   :type repository_names: [string]
 
@@ -52,6 +56,7 @@ class RobotWithPermissions(
     return {
       'name': self.name,
       '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
     }
@@ -61,18 +66,21 @@ class Robot(
   namedtuple('Robot', [
     'name',
     'password',
+    'created',
   ])):
   """
   Robot represents a robot entity.
   :type name: string
   :type password: string
+  :type created: datetime|None
 
   """
 
   def to_dict(self):
     return {
       'name': self.name,
-      'token': self.password
+      'token': self.password,
+      'created': format_date(self.created) if self.created is not None else None,
     }