Fix handling of multiple redo phases
  - set correct state
  - handle 4 phases, by moving START_FRAGCONF to end of phase instead of beginning...


storage/ndb/src/kernel/blocks/dblqh/Dblqh.hpp:
  remove unused state ACTIVE_REMOVE_AFTER
  remove unused variable nextLcp
  remove unused methods (BUILD_INDX)
  add counter of outstanding GSN_EXEC_FRAGREQ
  remove c_redo_complete_fragments cause it fits badly with functional multi-redo-phases
storage/ndb/src/kernel/blocks/dblqh/DblqhInit.cpp:
  remove unused stuff
storage/ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  1) set correct state before starting next non-empty REDO phase
  2) move GSN_START_FRAGCONF to execFRAGCONF instead of when sending GSN_EXEC_FRAGREQ
     or fragments with 4 redo-phases would never be complete...
storage/ndb/test/ndbapi/testSystemRestart.cpp:
  testcase
storage/ndb/test/run-test/daily-basic-tests.txt:
  testcase