Add missing parameter to strxnmov() that caused some INTO OUTFILE commands to core dump


mysql-test/mysql-test-run.sh:
  Ensure that clients used the supplied --socket argument
mysql-test/r/lowercase_table.result:
  Remove tables used in other tests that may affect this one
mysql-test/r/rename.result:
  Remove tables used in other tests that may affect this one
mysql-test/t/lowercase_table.test:
  Remove tables used in other tests that may affect this one
mysql-test/t/rename.test:
  Remove tables used in other tests that may affect this one
sql/item_cmpfunc.cc:
  Remove not relevant comment
sql/sql_class.cc:
  Add missing parameter to strxnmov() that caused some INTO OUTFILE commands to core dump
sql/sql_load.cc:
  Remove extra '/' after mysql_real_data_home
sql/sql_table.cc:
  Remove extra '/' after mysql_real_data_home