Moved some code to else path to avoid delete, create, delete, create scenarios.
Fixed up the partition info object for some cases where we move from default
partitioning in NDB to default partitioning using partitioning.


sql/sql_partition.cc:
  Added a new parameter for partition default handling
  This is to avoid calling get_no_parts on tables not yet
  created.
  Ensure that we don't reuse the old part_info object for
  any other operation than CREATE TABLE after reading up
  the frm file.
sql/sql_table.cc:
  Moved some code to else path to avoid delete, create, delete, create scenarios.
  Fixed up the partition info object for some cases where we move from default
  partitioning in NDB to default partitioning using partitioning.