Consider adding a Rocoto action to monitor jobs.

[christinaholtNOAA]

@mkavulich has introduced code to the SRW E2E testing framework that runs and monitors a Rocoto workflow through completion (or various forms of failure) and logs the results.

This functionality would be useful for any app running a Rocoto workflow and could be foundational for building testing frameworks for those apps. It also removes the need for a user to have cron installed, and its use is restricted on some platforms.

The idea is that this code would fit into the uw rocoto tool under a new action named something like monitor (not a requirement) and would take arguments indicating the paths to an XML, a database file, and a log file, and would issue rocotorun and rocotostat alternatively until the workflow fails or completes, logging the status with each iteration.

Mike also added the ability to restart a monitoring session from an existing log file, so we'd likely want to take that into account.