Fix tasks.clone schema

Reintroduce email field uniqueness

apiserver/database/model/auth.py

@@ -72,5 +72,5 @@ class User(DbModelMixin, AuthDocument):
     credentials = EmbeddedDocumentListField(Credentials, default=list)
     """ Credentials generated for this user """
 
-    email = EmailField()
+    email = EmailField(unique=True)
     """ Email uniquely identifying the user """

apiserver/schema/services/tasks.conf

@@ -792,8 +792,14 @@ clone {
                     description: "In case the new_project_name was specified returns the target project details"
                     type: object
                     properties {
-                        id: "The ID of the target project"
-                        name: "The name of the target project"
+                        id {
+                            description: "The ID of the target project"
+                            type: string
+                        }
+                        name {
+                            description: "The name of the target project"
+                            type: string
+                        }
                     }
                 }
             }