save moving ON/USING tables conditions to WHERE clause (BUG#2794)


sql/sql_base.cc:
  fix for table/field caching mechanism (global lock of it and right table passed as parameter)
  save moving ON/USING tables conditions to WHERE clause (BUG#2794)
sql/sql_class.cc:
  lock for using field/table cache in Item name resolution
sql/sql_class.h:
  lock for using field/table cache in Item name resolution
sql/sql_insert.cc:
  lock for using field/table cache in Item name resolution
tests/client_test.c:
  Test of PS queries with ON condition