Add checks to tapeout flow ensure each job did not have execution errors

[jeffdi]

Any error in any step needs to stop the process (precheck or tapeout) and report back the error.

I disagree with the above statement. I think tapeout should complete every check so it can identify all errors in each round of verification, and then all can be fixed before the next round of verification. What I think this ticket should cover are cases where the check failed due to an error in executed.

An example: a shuttle oasis file had multiple top level cells. One of the metal DRC jobs failed because of that. Multiple error messages was put in the log file and a blank RDB file was output. The summary script then listed zero errors in the summary file. This made it through onto the tapeout server without being identified as a problem.

mpw_precheck and tapeout both need to not only check the xml output for errors, but also check for error and warning messages in the log file.

[jeffdi]

does an error with any of the steps stop the flow and generate an error?