Add implementation of getTriggerNames for Mysql DB.

catalogue/CatalogueSchema.cpp

catalogue/CatalogueSchema.hpp

catalogue/MysqlCatalogueSchema.before_SQL.cpp

catalogue/MysqlCatalogueSchema.hpp

catalogue/VerifySchemaCmd.cpp

catalogue/VerifySchemaCmd.hpp

rdbms/Conn.cpp

rdbms/Conn.hpp

rdbms/wrapper/ConnWrapper.hpp

rdbms/wrapper/MysqlConn.cpp

rdbms/wrapper/MysqlConn.hpp

rdbms/wrapper/OcciConn.cpp

rdbms/wrapper/OcciConn.hpp

rdbms/wrapper/PostgresConn.cpp

rdbms/wrapper/PostgresConn.hpp

rdbms/wrapper/SqliteConn.cpp

rdbms/wrapper/SqliteConn.hpp