Move test rpl_server_id to suite rpl

mysql-test/suite/rpl/t/rpl_server_id.test:
  Rename: mysql-test/t/rpl_server_id.test -> mysql-test/suite/rpl/t/rpl_server_id.test
mysql-test/suite/rpl/r/rpl_server_id.result:
  Rename: mysql-test/r/rpl_server_id.result -> mysql-test/suite/rpl/r/rpl_server_id.result