Remove service registration code from mysqld.exe

Windows specific functionality "mysqld --install" , "mysqld --remove" should not be used anymore. This functionality is deprecated since we have mysql_install_db.exe, i.e 5.5. mysql_install_db.exe does the service registration and more.

Removing a service is a simple call to "sc delete <service_name>".

Also the logic "if mysqld.exe was started without parameters, lookup for MySQL service name and start it, if exists", this should be removed.