add ability to retry jobs in submit-grid-jobs

This commit updates submit-grid-jobs to look for jobs in the RETRY state and to
retry them if the number of retries is less than --max-retries. This way if you
ever want to retry a bunch of jobs you can update the database:

    $ sqlite3 ~/state.db
    sqlite> update state set state = 'RETRY' where state == 'FAILED';

And then rerun submit-grid-jobs with more retries:

    $ submit-grid-jobs --max-retries 10 ---auto

0 files changed, 0 insertions, 0 deletions