This is a post-fix patch to fix test failures with NDB.
Following are the changes done,

- Ignore 'ndbinfo' schema to be exposed by I_S system views.

  schema 'ndbinfo' and its tables are hidden when ndb cluster
  engine is not running or system variable "show_hidden" (
  exported by ndb plugin) is not set.

  In 5.7, ha_find_files() is called to check if the 'ndbinfo' schema
  and its table are hidden or not.
  Similarly, CAN_ACCESS_* UDFs used by I_S system views are modified
  to ignore 'ndbinfo' schema and its tables if they are hidden by
  calling ha_find_files().

- Adjust test cases to mask ndb% tables from I_S queries in test
  cases.