Attempt to fix rpl_relayrotate.test for host openbsd, fix suggested by Guilhem

# which proves that the transaction restarted at

# the right place.

# We must wait for the transaction to commit before

# reading, MASTER_POS_WAIT() will do it for sure

# (the only statement with position>=3000 is COMMIT).

select master_pos_wait('master-bin.001',3000)>=0;

# reading:

sync_with_master;

select max(a) from t1;

connection master;