WL#4189 mtr.pl v2

- rewrite "check warnings" to be faster by not creating a full join
   between error_log and suspicious_patterns while running REGEXP.
   Instead add a column to error_log that will be set to 1 to indicate
   a warning and run the 6 REGEXP's we have for suspicious lines as
   6 separate full table scans.
 - Remove the "suspicious_patterns" table from mtr db
 - Use 'xykls37' as separator when loading the error log, that line should
   hopefully never exist in a line that should be a warning

mysql-test/r/mysqlcheck.result

@@ -2,7 +2,6 @@ DROP TABLE IF EXISTS t1, `t``1`, `t 1`;
 drop view if exists v1;
 drop database if exists client_test_db;
 mtr.global_suppressions                            OK
-mtr.suspicious_patterns                            OK
 mtr.test_suppressions                              OK
 mysql.columns_priv                                 OK
 mysql.db                                           OK