Redo the fix for ErrorFile option does not handle pre-existing error files of the same name

The fix for JDK-8221738 was only intended to change the behaviour of the ErrorFile handling, but the implementation of that change affects all users of
prepare_log_file - which also affected the replay log file (see JDK-8223885). That was not expected/intended or approved by the CSR.

I propose that we rework that fix so that prepare_log_file takes a boolean parameter "can_overwrite" which is then passed through, so that we can only change the ErrorFile handling. If there is a desire to also change the replay log file handling then that should be done through its own RFE and CSR request.