added tests for testing structure of mysql db
client/mysqltest.c:
extend "replace" to column names
extend "disable_result_log" to output of --exec commad
mysql-test/install_test_db.sh:
corrected wrong column definitions (as a result of tests)
mysql-test/mysql-test-run.sh:
export MYSQL and MYSQL_FIX_SYSTEM_TABLES +
added option --result-file for *.opt files
scripts/mysql_fix_privilege_tables.sh:
added new options to using in tests +
added new alters (as a result of new tests)
scripts/mysql_fix_privilege_tables.sql:
added new alters (as a result of new tests)
scripts/mysql_install_db.sh:
corrected definition of tables_priv.Table_name
