When scan is completed, but lqhkeyreq is outstanding on primary replica and
  starting node dies, scan will not be closed leading to error handling of failed
  node not completing


ndb/src/kernel/blocks/ERROR_codes.txt:
  New error code
ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  Set scan state to WAIT_LQHKEY_COPY when scan is finished but LQHKEYREQ is outstanding