Fix problem with query cache and database names


mysql-test/mysql-test-run.sh:
  Portability fixes
mysql-test/r/query_cache.result:
  More tests when using different databases
mysql-test/t/query_cache.test:
  More tests when using different databases
sql-bench/test-wisconsin.sh:
  Portability fix
sql/sql_cache.cc:
  Fix problem with query cache and database names
sql/sql_parse.cc:
  Remove pre and end space in query.
sql/sql_table.cc:
  Limit created keys to MAX_KEY_LENGTH.