Remove partition state from frm file
Ensure we can still load tables created in 5.1.6 for the time
being


sql/table.cc:
  Remove partition state from frm file
  Ensure we can still load tables created in 5.1.6 for the time
  being
sql/unireg.cc:
  Remove partition state from frm file
  Ensure we can still load tables created in 5.1.6 for the time
  being