LQH computes incorrect hash values during NR (as it doesn't concider charsets)

  Solution: make LQH compute correct hash :-)
           1) move xfrm_key into SimulatedBlock so that there's _one_ impl.
           2) make TC, ACC, LQH use same impl.


ndb/include/kernel/AttributeDescriptor.hpp:
  Make SimulatedBlock use AttributeDescriptor (to xfrm)
ndb/src/kernel/blocks/dbacc/Dbacc.hpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dbacc/DbaccInit.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dbacc/DbaccMain.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dbdict/Dbdict.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dblqh/Dblqh.hpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dblqh/DblqhMain.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dbtc/Dbtc.hpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/blocks/dbtc/DbtcMain.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/vm/SimulatedBlock.cpp:
  Move xfrm handling into SimulatedBlock
ndb/src/kernel/vm/SimulatedBlock.hpp:
  Move xfrm handling into SimulatedBlock