Bug#27070 server logs are created unrequested and in wrong directory

- Setting up a A->B->A replication causes relay logs being written
  by the master, remove them when test is finished
 

mysql-test/t/rpl_dual_pos_advance.test

@@ -106,3 +106,9 @@ connection slave;
 sync_with_master;
 
 # End of 4.1 tests
+
+# Cleanup
+# The A->B->A replication causes the master to start writing relay logs
+# in var/run, remove them
+remove_file $MYSQLTEST_VARDIR/run/master-relay-bin.000001;
+remove_file $MYSQLTEST_VARDIR/run/master-relay-bin.index;