Bug #27710 Creating unique index fails during single user mode
  - enable indexes to be used always, if in single user, reject will happen before, and if it is kerlel doing stuff, it should always be allowed


ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
  Bug #27710 Creating unique index fails during single user mode
  - enable indexes to be used always, if in single user, reject will happen before, and if it is kerlel doing stuff, it should always be allowed